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: stable/10/usr.bin/ar/write.c 321775 2017-07-31 09:28:43Z emaste $"); 29 30#include <sys/endian.h> 31#include <sys/mman.h> 32#include <sys/queue.h> 33#include <sys/stat.h> 34#include <archive.h> 35#include <archive_entry.h> 36#include <errno.h> 37#include <fcntl.h> 38#include <gelf.h> 39#include <libgen.h> 40#include <stdio.h> 41#include <stdlib.h> 42#include <string.h> 43#include <sysexits.h> 44#include <unistd.h> 45 46#include "ar.h" 47 48#define _ARMAG_LEN 8 /* length of ar magic string */ 49#define _ARHDR_LEN 60 /* length of ar header */ 50#define _INIT_AS_CAP 128 /* initial archive string table size */ 51#define _INIT_SYMOFF_CAP (256*(sizeof(uint32_t))) /* initial so table size */ 52#define _INIT_SYMNAME_CAP 1024 /* initial sn table size */ 53#define _MAXNAMELEN_SVR4 15 /* max member name length in svr4 variant */ 54#define _TRUNCATE_LEN 15 /* number of bytes to keep for member name */ 55 56static void add_to_ar_str_table(struct bsdar *bsdar, const char *name); 57static void add_to_ar_sym_table(struct bsdar *bsdar, const char *name); 58static struct ar_obj *create_obj_from_file(struct bsdar *bsdar, 59 const char *name, time_t mtime); 60static void create_symtab_entry(struct bsdar *bsdar, void *maddr, 61 size_t size); 62static void free_obj(struct bsdar *bsdar, struct ar_obj *obj); 63static void insert_obj(struct bsdar *bsdar, struct ar_obj *obj, 64 struct ar_obj *pos); 65static void prefault_buffer(const char *buf, size_t s); 66static void read_objs(struct bsdar *bsdar, const char *archive, 67 int checkargv); 68static void write_archive(struct bsdar *bsdar, char mode); 69static void write_cleanup(struct bsdar *bsdar); 70static void write_data(struct bsdar *bsdar, struct archive *a, 71 const void *buf, size_t s); 72static void write_objs(struct bsdar *bsdar); 73 74void 75ar_mode_d(struct bsdar *bsdar) 76{ 77 78 write_archive(bsdar, 'd'); 79} 80 81void 82ar_mode_m(struct bsdar *bsdar) 83{ 84 85 write_archive(bsdar, 'm'); 86} 87 88void 89ar_mode_q(struct bsdar *bsdar) 90{ 91 92 write_archive(bsdar, 'q'); 93} 94 95void 96ar_mode_r(struct bsdar *bsdar) 97{ 98 99 write_archive(bsdar, 'r'); 100} 101 102void 103ar_mode_s(struct bsdar *bsdar) 104{ 105 106 write_archive(bsdar, 's'); 107} 108 109void 110ar_mode_A(struct bsdar *bsdar) 111{ 112 113 write_archive(bsdar, 'A'); 114} 115 116/* 117 * Create object from file, return created obj upon success, or NULL 118 * when an error occurs or the member is not newer than existing 119 * one while -u is specified. 120 */ 121static struct ar_obj * 122create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime) 123{ 124 struct ar_obj *obj; 125 struct stat sb; 126 const char *bname; 127 128 if (name == NULL) 129 return (NULL); 130 131 obj = malloc(sizeof(struct ar_obj)); 132 if (obj == NULL) 133 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 134 if ((obj->fd = open(name, O_RDONLY, 0)) < 0) { 135 bsdar_warnc(bsdar, errno, "can't open file: %s", name); 136 free(obj); 137 return (NULL); 138 } 139 140 if ((bname = basename(name)) == NULL) 141 bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed"); 142 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) { 143 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL) 144 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 145 (void)strncpy(obj->name, bname, _TRUNCATE_LEN); 146 obj->name[_TRUNCATE_LEN] = '\0'; 147 } else 148 if ((obj->name = strdup(bname)) == NULL) 149 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed"); 150 151 if (fstat(obj->fd, &sb) < 0) { 152 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name); 153 goto giveup; 154 } 155 if (!S_ISREG(sb.st_mode)) { 156 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name); 157 goto giveup; 158 } 159 160 /* 161 * When option '-u' is specified and member is not newer than the 162 * existing one, the replace will not happen. While if mtime == 0, 163 * which indicates that this is to "replace a none exist member", 164 * the replace will proceed regardless of '-u'. 165 */ 166 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime) 167 goto giveup; 168 169 /* 170 * When option '-D' is specified, mtime and UID / GID from the file 171 * will be replaced with 0, and file mode with 644. This ensures that 172 * checksums will match for two archives containing the exact same 173 * files. 174 */ 175 if (bsdar->options & AR_D) { 176 obj->uid = 0; 177 obj->gid = 0; 178 obj->mtime = 0; 179 obj->md = S_IFREG | 0644; 180 } else { 181 obj->uid = sb.st_uid; 182 obj->gid = sb.st_gid; 183 obj->mtime = sb.st_mtime; 184 obj->md = sb.st_mode; 185 } 186 obj->size = sb.st_size; 187 obj->dev = sb.st_dev; 188 obj->ino = sb.st_ino; 189 190 if (obj->size == 0) { 191 obj->maddr = NULL; 192 return (obj); 193 } 194 195 if ((obj->maddr = mmap(NULL, obj->size, PROT_READ, 196 MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) { 197 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name); 198 goto giveup; 199 } 200 if (close(obj->fd) < 0) 201 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s", 202 obj->name); 203 204 return (obj); 205 206giveup: 207 if (close(obj->fd) < 0) 208 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s", 209 obj->name); 210 free(obj->name); 211 free(obj); 212 return (NULL); 213} 214 215/* 216 * Free object itself and its associated allocations. 217 */ 218static void 219free_obj(struct bsdar *bsdar, struct ar_obj *obj) 220{ 221 if (obj->fd == -1) 222 free(obj->maddr); 223 else 224 if (obj->maddr != NULL && munmap(obj->maddr, obj->size)) 225 bsdar_warnc(bsdar, errno, 226 "can't munmap file: %s", obj->name); 227 free(obj->name); 228 free(obj); 229} 230 231/* 232 * Insert obj to the tail, or before/after the pos obj. 233 */ 234static void 235insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos) 236{ 237 if (obj == NULL) 238 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj"); 239 240 if (pos == NULL || obj == pos) 241 /* 242 * If the object to move happens to be the position obj, 243 * or if there is not a pos obj, move it to tail. 244 */ 245 goto tail; 246 247 if (bsdar->options & AR_B) { 248 TAILQ_INSERT_BEFORE(pos, obj, objs); 249 return; 250 } 251 if (bsdar->options & AR_A) { 252 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs); 253 return; 254 } 255 256tail: 257 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs); 258 259} 260 261/* 262 * Read objects from archive into v_obj list. Note that checkargv is 263 * set when read_objs is used to read objects from the target of 264 * ADDLIB command (ar script mode), in this case argv array possibly 265 * specifies the members ADDLIB want. 266 */ 267static void 268read_objs(struct bsdar *bsdar, const char *archive, int checkargv) 269{ 270 struct archive *a; 271 struct archive_entry *entry; 272 struct ar_obj *obj; 273 const char *name; 274 const char *bname; 275 char *buff; 276 char **av; 277 size_t size; 278 int i, r, find; 279 280 if ((a = archive_read_new()) == NULL) 281 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed"); 282 archive_read_support_format_ar(a); 283 AC(archive_read_open_filename(a, archive, DEF_BLKSZ)); 284 for (;;) { 285 r = archive_read_next_header(a, &entry); 286 if (r == ARCHIVE_FATAL) 287 bsdar_errc(bsdar, EX_DATAERR, 0, "%s", 288 archive_error_string(a)); 289 if (r == ARCHIVE_EOF) 290 break; 291 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY) 292 bsdar_warnc(bsdar, 0, "%s", archive_error_string(a)); 293 if (r == ARCHIVE_RETRY) { 294 bsdar_warnc(bsdar, 0, "Retrying..."); 295 continue; 296 } 297 298 name = archive_entry_pathname(entry); 299 300 /* 301 * skip pseudo members. 302 */ 303 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0) 304 continue; 305 306 /* 307 * If checkargv is set, only read those members specified 308 * in argv. 309 */ 310 if (checkargv && bsdar->argc > 0) { 311 find = 0; 312 for(i = 0; i < bsdar->argc; i++) { 313 av = &bsdar->argv[i]; 314 if (*av == NULL) 315 continue; 316 if ((bname = basename(*av)) == NULL) 317 bsdar_errc(bsdar, EX_SOFTWARE, errno, 318 "basename failed"); 319 if (strcmp(bname, name) != 0) 320 continue; 321 322 *av = NULL; 323 find = 1; 324 break; 325 } 326 if (!find) 327 continue; 328 } 329 330 size = archive_entry_size(entry); 331 332 if (size > 0) { 333 if ((buff = malloc(size)) == NULL) 334 bsdar_errc(bsdar, EX_SOFTWARE, errno, 335 "malloc failed"); 336 if (archive_read_data(a, buff, size) != (ssize_t)size) { 337 bsdar_warnc(bsdar, 0, "%s", 338 archive_error_string(a)); 339 free(buff); 340 continue; 341 } 342 } else 343 buff = NULL; 344 345 obj = malloc(sizeof(struct ar_obj)); 346 if (obj == NULL) 347 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 348 obj->maddr = buff; 349 if ((obj->name = strdup(name)) == NULL) 350 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed"); 351 obj->size = size; 352 obj->uid = archive_entry_uid(entry); 353 obj->gid = archive_entry_gid(entry); 354 obj->md = archive_entry_mode(entry); 355 obj->mtime = archive_entry_mtime(entry); 356 obj->dev = 0; 357 obj->ino = 0; 358 359 /* 360 * Objects from archive have obj->fd set to -1, 361 * for the ease of cleaning up. 362 */ 363 obj->fd = -1; 364 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs); 365 } 366 AC(archive_read_close(a)); 367 AC(archive_read_free(a)); 368} 369 370/* 371 * Determine the constitution of resulting archive. 372 */ 373static void 374write_archive(struct bsdar *bsdar, char mode) 375{ 376 struct ar_obj *nobj, *obj, *obj_temp, *pos; 377 struct stat sb; 378 const char *bname; 379 char **av; 380 int i; 381 382 TAILQ_INIT(&bsdar->v_obj); 383 nobj = NULL; 384 pos = NULL; 385 memset(&sb, 0, sizeof(sb)); 386 387 /* 388 * Test if the specified archive exists, to figure out 389 * whether we are creating one here. 390 */ 391 if (stat(bsdar->filename, &sb) != 0) { 392 if (errno != ENOENT) { 393 bsdar_warnc(bsdar, 0, "stat %s failed", 394 bsdar->filename); 395 return; 396 } 397 398 /* We do not create archive in mode 'd', 'm' and 's'. */ 399 if (mode != 'r' && mode != 'q') { 400 bsdar_warnc(bsdar, 0, "%s: no such file", 401 bsdar->filename); 402 return; 403 } 404 405 /* Issue a warning if -c is not specified when creating. */ 406 if (!(bsdar->options & AR_C)) 407 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename); 408 goto new_archive; 409 } 410 411 /* 412 * First read members from existing archive. 413 */ 414 read_objs(bsdar, bsdar->filename, 0); 415 416 /* 417 * For mode 's', no member will be moved, deleted or replaced. 418 */ 419 if (mode == 's') 420 goto write_objs; 421 422 /* 423 * For mode 'q', we don't need to adjust existing members either. 424 * Also, -a, -b and -i are ignored in this mode. New members are 425 * always inserted at tail. 426 */ 427 if (mode == 'q') 428 goto new_archive; 429 430 /* 431 * Mode 'A' adds the contents of another archive to the tail of 432 * current archive. Note that mode 'A' is a special mode for the 433 * ADDLIB command of the ar script mode. Currently there is no 434 * access to this function from the ar command line mode. 435 */ 436 if (mode == 'A') { 437 /* 438 * Read objects from the target archive of ADDLIB command. 439 * If there are members specified in argv, read those members 440 * only, otherwise the entire archive will be read. 441 */ 442 read_objs(bsdar, bsdar->addlib, 1); 443 goto write_objs; 444 } 445 446 /* 447 * Try to find the position member specified by user. 448 */ 449 if (bsdar->options & AR_A || bsdar->options & AR_B) { 450 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 451 if (strcmp(obj->name, bsdar->posarg) == 0) { 452 pos = obj; 453 break; 454 } 455 } 456 457 /* 458 * If can't find `pos' specified by user, 459 * silently insert objects at tail. 460 */ 461 if (pos == NULL) 462 bsdar->options &= ~(AR_A | AR_B); 463 } 464 465 for (i = 0; i < bsdar->argc; i++) { 466 av = &bsdar->argv[i]; 467 468 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 469 if ((bname = basename(*av)) == NULL) 470 bsdar_errc(bsdar, EX_SOFTWARE, errno, 471 "basename failed"); 472 if (bsdar->options & AR_TR) { 473 if (strncmp(bname, obj->name, _TRUNCATE_LEN)) 474 continue; 475 } else 476 if (strcmp(bname, obj->name) != 0) 477 continue; 478 479 if (mode == 'r') { 480 /* 481 * if the new member is not qualified 482 * to replace the old one, skip it. 483 */ 484 nobj = create_obj_from_file(bsdar, *av, 485 obj->mtime); 486 if (nobj == NULL) 487 goto skip_obj; 488 } 489 490 if (bsdar->options & AR_V) 491 (void)fprintf(stdout, "%c - %s\n", mode, 492 *av); 493 494 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 495 if (mode == 'd' || mode == 'r') 496 free_obj(bsdar, obj); 497 498 if (mode == 'm') 499 insert_obj(bsdar, obj, pos); 500 if (mode == 'r') 501 insert_obj(bsdar, nobj, pos); 502 503 skip_obj: 504 *av = NULL; 505 break; 506 } 507 508 } 509 510new_archive: 511 /* 512 * When operating in mode 'r', directly add those user specified 513 * objects which do not exist in current archive. When operating 514 * in mode 'q', all objects specified in command line args are 515 * appended to the archive, without comparing with existing ones. 516 */ 517 for (i = 0; i < bsdar->argc; i++) { 518 av = &bsdar->argv[i]; 519 if (*av != NULL && (mode == 'r' || mode == 'q')) { 520 nobj = create_obj_from_file(bsdar, *av, 0); 521 if (nobj != NULL) 522 insert_obj(bsdar, nobj, pos); 523 if (bsdar->options & AR_V && nobj != NULL) 524 (void)fprintf(stdout, "a - %s\n", *av); 525 *av = NULL; 526 } 527 } 528 529write_objs: 530 write_objs(bsdar); 531 write_cleanup(bsdar); 532} 533 534/* 535 * Memory cleaning up. 536 */ 537static void 538write_cleanup(struct bsdar *bsdar) 539{ 540 struct ar_obj *obj, *obj_temp; 541 542 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 543 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 544 free_obj(bsdar, obj); 545 } 546 547 free(bsdar->as); 548 free(bsdar->s_so); 549 free(bsdar->s_sn); 550 bsdar->as = NULL; 551 bsdar->s_so = NULL; 552 bsdar->s_sn = NULL; 553} 554 555/* 556 * Fault in the buffer prior to writing as a workaround for poor performance 557 * due to interaction with kernel fs deadlock avoidance code. See the comment 558 * above vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the issue. 559 */ 560static void 561prefault_buffer(const char *buf, size_t s) 562{ 563 volatile const char *p; 564 size_t page_size; 565 566 if (s == 0) 567 return; 568 page_size = sysconf(_SC_PAGESIZE); 569 for (p = buf; p < buf + s; p += page_size) 570 *p; 571 /* 572 * Ensure we touch the last page as well, in case the buffer is not 573 * page-aligned. 574 */ 575 *(volatile const char *)(buf + s - 1); 576} 577 578/* 579 * Wrapper for archive_write_data(). 580 */ 581static void 582write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s) 583{ 584 ssize_t written; 585 586 prefault_buffer(buf, s); 587 while (s > 0) { 588 written = archive_write_data(a, buf, s); 589 if (written < 0) 590 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s", 591 archive_error_string(a)); 592 buf = (const char *)buf + written; 593 s -= written; 594 } 595} 596 597/* 598 * Write the resulting archive members. 599 */ 600static void 601write_objs(struct bsdar *bsdar) 602{ 603 struct ar_obj *obj; 604 struct archive *a; 605 struct archive_entry *entry; 606 size_t s_sz; /* size of archive symbol table. */ 607 size_t pm_sz; /* size of pseudo members */ 608 int i, nr; 609 610 if (elf_version(EV_CURRENT) == EV_NONE) 611 bsdar_errc(bsdar, EX_SOFTWARE, 0, 612 "ELF library initialization failed: %s", elf_errmsg(-1)); 613 614 bsdar->rela_off = 0; 615 616 /* Create archive symbol table and archive string table, if need. */ 617 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 618 if (!(bsdar->options & AR_SS) && obj->maddr != NULL) 619 create_symtab_entry(bsdar, obj->maddr, obj->size); 620 if (strlen(obj->name) > _MAXNAMELEN_SVR4) 621 add_to_ar_str_table(bsdar, obj->name); 622 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2; 623 } 624 625 /* 626 * Pad the symbol name string table. It is treated specially because 627 * symbol name table should be padded by a '\0', not the common '\n' 628 * for other members. The size of sn table includes the pad bit. 629 */ 630 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0) 631 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 632 633 /* 634 * Archive string table is padded by a "\n" as the normal members. 635 * The difference is that the size of archive string table counts 636 * in the pad bit, while normal members' size fileds do not. 637 */ 638 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0) 639 bsdar->as[bsdar->as_sz++] = '\n'; 640 641 /* 642 * If there is a symbol table, calculate the size of pseudo members, 643 * convert previously stored relative offsets to absolute ones, and 644 * then make them Big Endian. 645 * 646 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members) 647 */ 648 649 if (bsdar->s_cnt != 0) { 650 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz; 651 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz); 652 if (bsdar->as != NULL) 653 pm_sz += _ARHDR_LEN + bsdar->as_sz; 654 for (i = 0; (size_t)i < bsdar->s_cnt; i++) 655 *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) + 656 pm_sz); 657 } 658 659 if ((a = archive_write_new()) == NULL) 660 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed"); 661 662 archive_write_set_format_ar_svr4(a); 663 664 AC(archive_write_open_filename(a, bsdar->filename)); 665 666 /* 667 * write the archive symbol table, if there is one. 668 * If options -s is explicitly specified or we are invoked 669 * as ranlib, write the symbol table even if it is empty. 670 */ 671 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) || 672 bsdar->options & AR_S) { 673 entry = archive_entry_new(); 674 archive_entry_copy_pathname(entry, "/"); 675 if ((bsdar->options & AR_D) == 0) 676 archive_entry_set_mtime(entry, time(NULL), 0); 677 archive_entry_set_size(entry, (bsdar->s_cnt + 1) * 678 sizeof(uint32_t) + bsdar->s_sn_sz); 679 AC(archive_write_header(a, entry)); 680 nr = htobe32(bsdar->s_cnt); 681 write_data(bsdar, a, &nr, sizeof(uint32_t)); 682 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) * 683 bsdar->s_cnt); 684 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz); 685 archive_entry_free(entry); 686 } 687 688 /* write the archive string table, if any. */ 689 if (bsdar->as != NULL) { 690 entry = archive_entry_new(); 691 archive_entry_copy_pathname(entry, "//"); 692 archive_entry_set_size(entry, bsdar->as_sz); 693 AC(archive_write_header(a, entry)); 694 write_data(bsdar, a, bsdar->as, bsdar->as_sz); 695 archive_entry_free(entry); 696 } 697 698 /* write normal members. */ 699 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 700 entry = archive_entry_new(); 701 archive_entry_copy_pathname(entry, obj->name); 702 archive_entry_set_uid(entry, obj->uid); 703 archive_entry_set_gid(entry, obj->gid); 704 archive_entry_set_mode(entry, obj->md); 705 archive_entry_set_size(entry, obj->size); 706 archive_entry_set_mtime(entry, obj->mtime, 0); 707 archive_entry_set_dev(entry, obj->dev); 708 archive_entry_set_ino(entry, obj->ino); 709 archive_entry_set_filetype(entry, AE_IFREG); 710 AC(archive_write_header(a, entry)); 711 write_data(bsdar, a, obj->maddr, obj->size); 712 archive_entry_free(entry); 713 } 714 715 AC(archive_write_close(a)); 716 AC(archive_write_free(a)); 717} 718 719/* 720 * Extract global symbols from ELF binary members. 721 */ 722static void 723create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size) 724{ 725 Elf *e; 726 Elf_Scn *scn; 727 GElf_Shdr shdr; 728 GElf_Sym sym; 729 Elf_Data *data; 730 char *name; 731 size_t n, shstrndx; 732 int elferr, tabndx, len, i; 733 734 if ((e = elf_memory(maddr, size)) == NULL) { 735 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s", 736 elf_errmsg(-1)); 737 return; 738 } 739 if (elf_kind(e) != ELF_K_ELF) { 740 /* Silently ignore non-elf member. */ 741 elf_end(e); 742 return; 743 } 744 if (elf_getshstrndx(e, &shstrndx) == 0) { 745 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s", 746 elf_errmsg(-1)); 747 elf_end(e); 748 return; 749 } 750 751 tabndx = -1; 752 scn = NULL; 753 while ((scn = elf_nextscn(e, scn)) != NULL) { 754 if (gelf_getshdr(scn, &shdr) != &shdr) { 755 bsdar_warnc(bsdar, 0, 756 "elf_getshdr failed: %s", elf_errmsg(-1)); 757 continue; 758 } 759 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) { 760 bsdar_warnc(bsdar, 0, 761 "elf_strptr failed: %s", elf_errmsg(-1)); 762 continue; 763 } 764 if (strcmp(name, ".strtab") == 0) { 765 tabndx = elf_ndxscn(scn); 766 break; 767 } 768 } 769 elferr = elf_errno(); 770 if (elferr != 0) 771 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s", 772 elf_errmsg(elferr)); 773 if (tabndx == -1) { 774 bsdar_warnc(bsdar, 0, "can't find .strtab section"); 775 elf_end(e); 776 return; 777 } 778 779 scn = NULL; 780 while ((scn = elf_nextscn(e, scn)) != NULL) { 781 if (gelf_getshdr(scn, &shdr) != &shdr) { 782 bsdar_warnc(bsdar, EX_SOFTWARE, 0, 783 "elf_getshdr failed: %s", elf_errmsg(-1)); 784 continue; 785 } 786 if (shdr.sh_type != SHT_SYMTAB) 787 continue; 788 789 data = NULL; 790 n = 0; 791 while (n < shdr.sh_size && 792 (data = elf_getdata(scn, data)) != NULL) { 793 len = data->d_size / shdr.sh_entsize; 794 for (i = 0; i < len; i++) { 795 if (gelf_getsym(data, i, &sym) != &sym) { 796 bsdar_warnc(bsdar, EX_SOFTWARE, 0, 797 "gelf_getsym failed: %s", 798 elf_errmsg(-1)); 799 continue; 800 } 801 802 /* keep only global or weak symbols */ 803 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL && 804 GELF_ST_BIND(sym.st_info) != STB_WEAK) 805 continue; 806 807 /* keep only defined symbols */ 808 if (sym.st_shndx == SHN_UNDEF) 809 continue; 810 811 if ((name = elf_strptr(e, tabndx, 812 sym.st_name)) == NULL) { 813 bsdar_warnc(bsdar, EX_SOFTWARE, 0, 814 "elf_strptr failed: %s", 815 elf_errmsg(-1)); 816 continue; 817 } 818 819 add_to_ar_sym_table(bsdar, name); 820 } 821 } 822 } 823 elferr = elf_errno(); 824 if (elferr != 0) 825 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s", 826 elf_errmsg(elferr)); 827 828 elf_end(e); 829} 830 831/* 832 * Append to the archive string table buffer. 833 */ 834static void 835add_to_ar_str_table(struct bsdar *bsdar, const char *name) 836{ 837 838 if (bsdar->as == NULL) { 839 bsdar->as_cap = _INIT_AS_CAP; 840 bsdar->as_sz = 0; 841 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL) 842 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 843 } 844 845 /* 846 * The space required for holding one member name in as table includes: 847 * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding). 848 */ 849 while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) { 850 bsdar->as_cap *= 2; 851 bsdar->as = realloc(bsdar->as, bsdar->as_cap); 852 if (bsdar->as == NULL) 853 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 854 } 855 strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name)); 856 bsdar->as_sz += strlen(name); 857 bsdar->as[bsdar->as_sz++] = '/'; 858 bsdar->as[bsdar->as_sz++] = '\n'; 859} 860 861/* 862 * Append to the archive symbol table buffer. 863 */ 864static void 865add_to_ar_sym_table(struct bsdar *bsdar, const char *name) 866{ 867 868 if (bsdar->s_so == NULL) { 869 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) == 870 NULL) 871 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 872 bsdar->s_so_cap = _INIT_SYMOFF_CAP; 873 bsdar->s_cnt = 0; 874 } 875 876 if (bsdar->s_sn == NULL) { 877 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL) 878 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 879 bsdar->s_sn_cap = _INIT_SYMNAME_CAP; 880 bsdar->s_sn_sz = 0; 881 } 882 883 if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) { 884 bsdar->s_so_cap *= 2; 885 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap); 886 if (bsdar->s_so == NULL) 887 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 888 } 889 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off; 890 bsdar->s_cnt++; 891 892 /* 893 * The space required for holding one symbol name in sn table includes: 894 * strlen(name) + (1 for '\n') + (possibly 1 for padding). 895 */ 896 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) { 897 bsdar->s_sn_cap *= 2; 898 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap); 899 if (bsdar->s_sn == NULL) 900 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 901 } 902 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name)); 903 bsdar->s_sn_sz += strlen(name); 904 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 905} 906