1/*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2007 Kai Wang 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29#include <sys/cdefs.h> 30__FBSDID("$FreeBSD$"); 31 32#include <sys/endian.h> 33#include <sys/mman.h> 34#include <sys/queue.h> 35#include <sys/stat.h> 36#include <archive.h> 37#include <archive_entry.h> 38#include <errno.h> 39#include <fcntl.h> 40#include <gelf.h> 41#include <libgen.h> 42#include <stdio.h> 43#include <stdlib.h> 44#include <string.h> 45#include <sysexits.h> 46#include <unistd.h> 47 48#include "ar.h" 49 50#define _ARMAG_LEN 8 /* length of ar magic string */ 51#define _ARHDR_LEN 60 /* length of ar header */ 52#define _INIT_AS_CAP 128 /* initial archive string table size */ 53#define _INIT_SYMOFF_CAP (256*(sizeof(uint64_t))) /* initial so table size */ 54#define _INIT_SYMNAME_CAP 1024 /* initial sn table size */ 55#define _MAXNAMELEN_SVR4 15 /* max member name length in svr4 variant */ 56#define _TRUNCATE_LEN 15 /* number of bytes to keep for member name */ 57 58static void add_to_ar_str_table(struct bsdar *bsdar, const char *name); 59static void add_to_ar_sym_table(struct bsdar *bsdar, const char *name); 60static struct ar_obj *create_obj_from_file(struct bsdar *bsdar, 61 const char *name, time_t mtime); 62static void create_symtab_entry(struct bsdar *bsdar, void *maddr, 63 size_t size); 64static void free_obj(struct bsdar *bsdar, struct ar_obj *obj); 65static void insert_obj(struct bsdar *bsdar, struct ar_obj *obj, 66 struct ar_obj *pos); 67static void prefault_buffer(const char *buf, size_t s); 68static void read_objs(struct bsdar *bsdar, const char *archive, 69 int checkargv); 70static void write_archive(struct bsdar *bsdar, char mode); 71static void write_cleanup(struct bsdar *bsdar); 72static void write_data(struct bsdar *bsdar, struct archive *a, 73 const void *buf, size_t s); 74static void write_objs(struct bsdar *bsdar); 75 76void 77ar_mode_d(struct bsdar *bsdar) 78{ 79 80 write_archive(bsdar, 'd'); 81} 82 83void 84ar_mode_m(struct bsdar *bsdar) 85{ 86 87 write_archive(bsdar, 'm'); 88} 89 90void 91ar_mode_q(struct bsdar *bsdar) 92{ 93 94 write_archive(bsdar, 'q'); 95} 96 97void 98ar_mode_r(struct bsdar *bsdar) 99{ 100 101 write_archive(bsdar, 'r'); 102} 103 104void 105ar_mode_s(struct bsdar *bsdar) 106{ 107 108 write_archive(bsdar, 's'); 109} 110 111void 112ar_mode_A(struct bsdar *bsdar) 113{ 114 115 write_archive(bsdar, 'A'); 116} 117 118/* 119 * Create object from file, return created obj upon success, or NULL 120 * when an error occurs or the member is not newer than existing 121 * one while -u is specified. 122 */ 123static struct ar_obj * 124create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime) 125{ 126 struct ar_obj *obj; 127 struct stat sb; 128 const char *bname; 129 char *tmpname; 130 131 if (name == NULL) 132 return (NULL); 133 134 obj = malloc(sizeof(struct ar_obj)); 135 if (obj == NULL) 136 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 137 if ((obj->fd = open(name, O_RDONLY, 0)) < 0) { 138 bsdar_warnc(bsdar, errno, "can't open file: %s", name); 139 free(obj); 140 return (NULL); 141 } 142 143 tmpname = strdup(name); 144 if (tmpname == NULL) 145 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed"); 146 if ((bname = basename(tmpname)) == NULL) 147 bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed"); 148 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) { 149 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL) 150 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 151 (void)strncpy(obj->name, bname, _TRUNCATE_LEN); 152 obj->name[_TRUNCATE_LEN] = '\0'; 153 } else 154 if ((obj->name = strdup(bname)) == NULL) 155 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed"); 156 free(tmpname); 157 158 if (fstat(obj->fd, &sb) < 0) { 159 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name); 160 goto giveup; 161 } 162 if (!S_ISREG(sb.st_mode)) { 163 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name); 164 goto giveup; 165 } 166 167 /* 168 * When option '-u' is specified and member is not newer than the 169 * existing one, the replace will not happen. While if mtime == 0, 170 * which indicates that this is to "replace a none exist member", 171 * the replace will proceed regardless of '-u'. 172 */ 173 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime) 174 goto giveup; 175 176 /* 177 * When option '-D' is specified, mtime and UID / GID from the file 178 * will be replaced with 0, and file mode with 644. This ensures that 179 * checksums will match for two archives containing the exact same 180 * files. 181 */ 182 if (bsdar->options & AR_D) { 183 obj->uid = 0; 184 obj->gid = 0; 185 obj->mtime = 0; 186 obj->md = S_IFREG | 0644; 187 } else { 188 obj->uid = sb.st_uid; 189 obj->gid = sb.st_gid; 190 obj->mtime = sb.st_mtime; 191 obj->md = sb.st_mode; 192 } 193 obj->size = sb.st_size; 194 obj->dev = sb.st_dev; 195 obj->ino = sb.st_ino; 196 197 if (obj->size == 0) { 198 obj->maddr = NULL; 199 return (obj); 200 } 201 202 if ((obj->maddr = mmap(NULL, obj->size, PROT_READ, 203 MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) { 204 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name); 205 goto giveup; 206 } 207 if (close(obj->fd) < 0) 208 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s", 209 obj->name); 210 211 return (obj); 212 213giveup: 214 if (close(obj->fd) < 0) 215 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s", 216 obj->name); 217 free(obj->name); 218 free(obj); 219 return (NULL); 220} 221 222/* 223 * Free object itself and its associated allocations. 224 */ 225static void 226free_obj(struct bsdar *bsdar, struct ar_obj *obj) 227{ 228 if (obj->fd == -1) 229 free(obj->maddr); 230 else 231 if (obj->maddr != NULL && munmap(obj->maddr, obj->size)) 232 bsdar_warnc(bsdar, errno, 233 "can't munmap file: %s", obj->name); 234 free(obj->name); 235 free(obj); 236} 237 238/* 239 * Insert obj to the tail, or before/after the pos obj. 240 */ 241static void 242insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos) 243{ 244 if (obj == NULL) 245 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj"); 246 247 if (pos == NULL || obj == pos) 248 /* 249 * If the object to move happens to be the position obj, 250 * or if there is not a pos obj, move it to tail. 251 */ 252 goto tail; 253 254 if (bsdar->options & AR_B) { 255 TAILQ_INSERT_BEFORE(pos, obj, objs); 256 return; 257 } 258 if (bsdar->options & AR_A) { 259 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs); 260 return; 261 } 262 263tail: 264 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs); 265 266} 267 268/* 269 * Read objects from archive into v_obj list. Note that checkargv is 270 * set when read_objs is used to read objects from the target of 271 * ADDLIB command (ar script mode), in this case argv array possibly 272 * specifies the members ADDLIB want. 273 */ 274static void 275read_objs(struct bsdar *bsdar, const char *archive, int checkargv) 276{ 277 struct archive *a; 278 struct archive_entry *entry; 279 struct ar_obj *obj; 280 const char *name; 281 const char *bname; 282 char *buff; 283 char **av; 284 size_t size; 285 int i, r, find; 286 287 if ((a = archive_read_new()) == NULL) 288 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed"); 289 archive_read_support_format_ar(a); 290 AC(archive_read_open_filename(a, archive, DEF_BLKSZ)); 291 for (;;) { 292 r = archive_read_next_header(a, &entry); 293 if (r == ARCHIVE_FATAL) 294 bsdar_errc(bsdar, EX_DATAERR, archive_errno(a), "%s", 295 archive_error_string(a)); 296 if (r == ARCHIVE_EOF) 297 break; 298 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY) 299 bsdar_warnc(bsdar, archive_errno(a), "%s", 300 archive_error_string(a)); 301 if (r == ARCHIVE_RETRY) { 302 bsdar_warnc(bsdar, 0, "Retrying..."); 303 continue; 304 } 305 306 name = archive_entry_pathname(entry); 307 308 /* 309 * skip pseudo members. 310 */ 311 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0) 312 continue; 313 314 /* 315 * If checkargv is set, only read those members specified 316 * in argv. 317 */ 318 if (checkargv && bsdar->argc > 0) { 319 find = 0; 320 for(i = 0; i < bsdar->argc; i++) { 321 av = &bsdar->argv[i]; 322 if (*av == NULL) 323 continue; 324 if ((bname = basename(*av)) == NULL) 325 bsdar_errc(bsdar, EX_SOFTWARE, errno, 326 "basename failed"); 327 if (strcmp(bname, name) != 0) 328 continue; 329 330 *av = NULL; 331 find = 1; 332 break; 333 } 334 if (!find) 335 continue; 336 } 337 338 size = archive_entry_size(entry); 339 340 if (size > 0) { 341 if ((buff = malloc(size)) == NULL) 342 bsdar_errc(bsdar, EX_SOFTWARE, errno, 343 "malloc failed"); 344 if (archive_read_data(a, buff, size) != (ssize_t)size) { 345 bsdar_warnc(bsdar, archive_errno(a), "%s", 346 archive_error_string(a)); 347 free(buff); 348 continue; 349 } 350 } else 351 buff = NULL; 352 353 obj = malloc(sizeof(struct ar_obj)); 354 if (obj == NULL) 355 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 356 obj->maddr = buff; 357 if ((obj->name = strdup(name)) == NULL) 358 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed"); 359 obj->size = size; 360 obj->uid = archive_entry_uid(entry); 361 obj->gid = archive_entry_gid(entry); 362 obj->md = archive_entry_mode(entry); 363 obj->mtime = archive_entry_mtime(entry); 364 obj->dev = 0; 365 obj->ino = 0; 366 367 /* 368 * Objects from archive have obj->fd set to -1, 369 * for the ease of cleaning up. 370 */ 371 obj->fd = -1; 372 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs); 373 } 374 AC(archive_read_close(a)); 375 AC(archive_read_free(a)); 376} 377 378/* 379 * Determine the constitution of resulting archive. 380 */ 381static void 382write_archive(struct bsdar *bsdar, char mode) 383{ 384 struct ar_obj *nobj, *obj, *obj_temp, *pos; 385 struct stat sb; 386 const char *bname; 387 char **av; 388 int i; 389 390 TAILQ_INIT(&bsdar->v_obj); 391 nobj = NULL; 392 pos = NULL; 393 memset(&sb, 0, sizeof(sb)); 394 395 /* 396 * Test if the specified archive exists, to figure out 397 * whether we are creating one here. 398 */ 399 if (stat(bsdar->filename, &sb) != 0) { 400 if (errno != ENOENT) { 401 bsdar_warnc(bsdar, 0, "stat %s failed", 402 bsdar->filename); 403 return; 404 } 405 406 /* We do not create archive in mode 'd', 'm' and 's'. */ 407 if (mode != 'r' && mode != 'q') { 408 bsdar_warnc(bsdar, 0, "%s: no such file", 409 bsdar->filename); 410 return; 411 } 412 413 /* Issue a warning if -c is not specified when creating. */ 414 if (!(bsdar->options & AR_C)) 415 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename); 416 goto new_archive; 417 } 418 419 /* 420 * First read members from existing archive. 421 */ 422 read_objs(bsdar, bsdar->filename, 0); 423 424 /* 425 * For mode 's', no member will be moved, deleted or replaced. 426 */ 427 if (mode == 's') 428 goto write_objs; 429 430 /* 431 * For mode 'q', we don't need to adjust existing members either. 432 * Also, -a, -b and -i are ignored in this mode. New members are 433 * always inserted at tail. 434 */ 435 if (mode == 'q') 436 goto new_archive; 437 438 /* 439 * Mode 'A' adds the contents of another archive to the tail of 440 * current archive. Note that mode 'A' is a special mode for the 441 * ADDLIB command of the ar script mode. Currently there is no 442 * access to this function from the ar command line mode. 443 */ 444 if (mode == 'A') { 445 /* 446 * Read objects from the target archive of ADDLIB command. 447 * If there are members specified in argv, read those members 448 * only, otherwise the entire archive will be read. 449 */ 450 read_objs(bsdar, bsdar->addlib, 1); 451 goto write_objs; 452 } 453 454 /* 455 * Try to find the position member specified by user. 456 */ 457 if (bsdar->options & AR_A || bsdar->options & AR_B) { 458 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 459 if (strcmp(obj->name, bsdar->posarg) == 0) { 460 pos = obj; 461 break; 462 } 463 } 464 465 /* 466 * If can't find `pos' specified by user, 467 * silently insert objects at tail. 468 */ 469 if (pos == NULL) 470 bsdar->options &= ~(AR_A | AR_B); 471 } 472 473 for (i = 0; i < bsdar->argc; i++) { 474 av = &bsdar->argv[i]; 475 476 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 477 if ((bname = basename(*av)) == NULL) 478 bsdar_errc(bsdar, EX_SOFTWARE, errno, 479 "basename failed"); 480 if (bsdar->options & AR_TR) { 481 if (strncmp(bname, obj->name, _TRUNCATE_LEN)) 482 continue; 483 } else 484 if (strcmp(bname, obj->name) != 0) 485 continue; 486 487 if (mode == 'r') { 488 /* 489 * if the new member is not qualified 490 * to replace the old one, skip it. 491 */ 492 nobj = create_obj_from_file(bsdar, *av, 493 obj->mtime); 494 if (nobj == NULL) 495 goto skip_obj; 496 } 497 498 if (bsdar->options & AR_V) 499 (void)fprintf(stdout, "%c - %s\n", mode, 500 *av); 501 502 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 503 if (mode == 'd' || mode == 'r') 504 free_obj(bsdar, obj); 505 506 if (mode == 'm') 507 insert_obj(bsdar, obj, pos); 508 if (mode == 'r') 509 insert_obj(bsdar, nobj, pos); 510 511 skip_obj: 512 *av = NULL; 513 break; 514 } 515 516 } 517 518new_archive: 519 /* 520 * When operating in mode 'r', directly add those user specified 521 * objects which do not exist in current archive. When operating 522 * in mode 'q', all objects specified in command line args are 523 * appended to the archive, without comparing with existing ones. 524 */ 525 for (i = 0; i < bsdar->argc; i++) { 526 av = &bsdar->argv[i]; 527 if (*av != NULL && (mode == 'r' || mode == 'q')) { 528 nobj = create_obj_from_file(bsdar, *av, 0); 529 if (nobj != NULL) 530 insert_obj(bsdar, nobj, pos); 531 if (bsdar->options & AR_V && nobj != NULL) 532 (void)fprintf(stdout, "a - %s\n", *av); 533 *av = NULL; 534 } 535 } 536 537write_objs: 538 write_objs(bsdar); 539 write_cleanup(bsdar); 540} 541 542/* 543 * Memory cleaning up. 544 */ 545static void 546write_cleanup(struct bsdar *bsdar) 547{ 548 struct ar_obj *obj, *obj_temp; 549 550 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 551 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 552 free_obj(bsdar, obj); 553 } 554 555 free(bsdar->as); 556 free(bsdar->s_so); 557 free(bsdar->s_sn); 558 bsdar->as = NULL; 559 bsdar->s_so = NULL; 560 bsdar->s_so_max = 0; 561 bsdar->s_sn = NULL; 562} 563 564/* 565 * Fault in the buffer prior to writing as a workaround for poor performance 566 * due to interaction with kernel fs deadlock avoidance code. See the comment 567 * above vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the issue. 568 */ 569static void 570prefault_buffer(const char *buf, size_t s) 571{ 572 volatile const char *p; 573 size_t page_size; 574 575 if (s == 0) 576 return; 577 page_size = sysconf(_SC_PAGESIZE); 578 for (p = buf; p < buf + s; p += page_size) 579 *p; 580 /* 581 * Ensure we touch the last page as well, in case the buffer is not 582 * page-aligned. 583 */ 584 *(volatile const char *)(buf + s - 1); 585} 586 587/* 588 * Wrapper for archive_write_data(). 589 */ 590static void 591write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s) 592{ 593 ssize_t written; 594 595 prefault_buffer(buf, s); 596 while (s > 0) { 597 written = archive_write_data(a, buf, s); 598 if (written < 0) 599 bsdar_errc(bsdar, EX_SOFTWARE, archive_errno(a), "%s", 600 archive_error_string(a)); 601 buf = (const char *)buf + written; 602 s -= written; 603 } 604} 605 606/* 607 * Write the resulting archive members. 608 */ 609static void 610write_objs(struct bsdar *bsdar) 611{ 612 struct ar_obj *obj; 613 struct archive *a; 614 struct archive_entry *entry; 615 size_t s_sz; /* size of archive symbol table. */ 616 size_t pm_sz; /* size of pseudo members */ 617 size_t w_sz; /* size of words in symbol table */ 618 size_t i; 619 uint64_t nr; 620 uint32_t nr32; 621 622 if (elf_version(EV_CURRENT) == EV_NONE) 623 bsdar_errc(bsdar, EX_SOFTWARE, 0, 624 "ELF library initialization failed: %s", elf_errmsg(-1)); 625 626 bsdar->rela_off = 0; 627 628 /* Create archive symbol table and archive string table, if need. */ 629 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 630 if (!(bsdar->options & AR_SS) && obj->maddr != NULL) 631 create_symtab_entry(bsdar, obj->maddr, obj->size); 632 if (strlen(obj->name) > _MAXNAMELEN_SVR4) 633 add_to_ar_str_table(bsdar, obj->name); 634 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2; 635 } 636 637 /* 638 * Pad the symbol name string table. It is treated specially because 639 * symbol name table should be padded by a '\0', not the common '\n' 640 * for other members. The size of sn table includes the pad bit. 641 */ 642 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0) 643 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 644 645 /* 646 * Archive string table is padded by a "\n" as the normal members. 647 * The difference is that the size of archive string table counts 648 * in the pad bit, while normal members' size fileds do not. 649 */ 650 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0) 651 bsdar->as[bsdar->as_sz++] = '\n'; 652 653 /* 654 * If there is a symbol table, calculate the size of pseudo members, 655 * convert previously stored relative offsets to absolute ones, and 656 * then make them Big Endian. 657 * 658 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members) 659 */ 660 w_sz = sizeof(uint32_t); 661 if (bsdar->s_cnt != 0) { 662 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz; 663 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz); 664 if (bsdar->as != NULL) 665 pm_sz += _ARHDR_LEN + bsdar->as_sz; 666 /* Use the 64-bit word size format if necessary. */ 667 if (bsdar->s_so_max > UINT32_MAX - pm_sz) { 668 w_sz = sizeof(uint64_t); 669 pm_sz -= s_sz; 670 s_sz = (bsdar->s_cnt + 1) * sizeof(uint64_t) + 671 bsdar->s_sn_sz; 672 pm_sz += s_sz; 673 /* Convert to big-endian. */ 674 for (i = 0; i < bsdar->s_cnt; i++) 675 bsdar->s_so[i] = 676 htobe64(bsdar->s_so[i] + pm_sz); 677 } else { 678 /* 679 * Convert to big-endian and shuffle in-place to 680 * the front of the allocation. XXX UB 681 */ 682 for (i = 0; i < bsdar->s_cnt; i++) 683 ((uint32_t *)(bsdar->s_so))[i] = 684 htobe32(bsdar->s_so[i] + pm_sz); 685 } 686 } 687 688 if ((a = archive_write_new()) == NULL) 689 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed"); 690 691 archive_write_set_format_ar_svr4(a); 692 693 AC(archive_write_open_filename(a, bsdar->filename)); 694 695 /* 696 * write the archive symbol table, if there is one. 697 * If options -s is explicitly specified or we are invoked 698 * as ranlib, write the symbol table even if it is empty. 699 */ 700 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) || 701 bsdar->options & AR_S) { 702 entry = archive_entry_new(); 703 if (entry == NULL) 704 bsdar_errc(bsdar, EX_SOFTWARE, 0, 705 "archive_entry_new failed"); 706 if (w_sz == sizeof(uint64_t)) 707 archive_entry_copy_pathname(entry, "/SYM64/"); 708 else 709 archive_entry_copy_pathname(entry, "/"); 710 if ((bsdar->options & AR_D) == 0) 711 archive_entry_set_mtime(entry, time(NULL), 0); 712 archive_entry_set_size(entry, (bsdar->s_cnt + 1) * w_sz + 713 bsdar->s_sn_sz); 714 AC(archive_write_header(a, entry)); 715 if (w_sz == sizeof(uint64_t)) { 716 nr = htobe64(bsdar->s_cnt); 717 write_data(bsdar, a, &nr, sizeof(nr)); 718 } else { 719 nr32 = htobe32((uint32_t)bsdar->s_cnt); 720 write_data(bsdar, a, &nr32, sizeof(nr32)); 721 } 722 write_data(bsdar, a, bsdar->s_so, w_sz * bsdar->s_cnt); 723 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz); 724 archive_entry_free(entry); 725 } 726 727 /* write the archive string table, if any. */ 728 if (bsdar->as != NULL) { 729 entry = archive_entry_new(); 730 if (entry == NULL) 731 bsdar_errc(bsdar, EX_SOFTWARE, 0, 732 "archive_entry_new failed"); 733 archive_entry_copy_pathname(entry, "//"); 734 archive_entry_set_size(entry, bsdar->as_sz); 735 AC(archive_write_header(a, entry)); 736 write_data(bsdar, a, bsdar->as, bsdar->as_sz); 737 archive_entry_free(entry); 738 } 739 740 /* write normal members. */ 741 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 742 entry = archive_entry_new(); 743 if (entry == NULL) 744 bsdar_errc(bsdar, EX_SOFTWARE, 0, 745 "archive_entry_new failed"); 746 archive_entry_copy_pathname(entry, obj->name); 747 archive_entry_set_uid(entry, obj->uid); 748 archive_entry_set_gid(entry, obj->gid); 749 archive_entry_set_mode(entry, obj->md); 750 archive_entry_set_size(entry, obj->size); 751 archive_entry_set_mtime(entry, obj->mtime, 0); 752 archive_entry_set_dev(entry, obj->dev); 753 archive_entry_set_ino(entry, obj->ino); 754 archive_entry_set_filetype(entry, AE_IFREG); 755 AC(archive_write_header(a, entry)); 756 write_data(bsdar, a, obj->maddr, obj->size); 757 archive_entry_free(entry); 758 } 759 760 AC(archive_write_close(a)); 761 AC(archive_write_free(a)); 762} 763 764/* 765 * Extract global symbols from ELF binary members. 766 */ 767static void 768create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size) 769{ 770 Elf *e; 771 Elf_Scn *scn; 772 GElf_Shdr shdr; 773 GElf_Sym sym; 774 Elf_Data *data; 775 char *name; 776 size_t n, shstrndx; 777 int elferr, tabndx, len, i; 778 779 if ((e = elf_memory(maddr, size)) == NULL) { 780 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s", 781 elf_errmsg(-1)); 782 return; 783 } 784 if (elf_kind(e) != ELF_K_ELF) { 785 /* Silently ignore non-elf member. */ 786 elf_end(e); 787 return; 788 } 789 if (elf_getshstrndx(e, &shstrndx) == 0) { 790 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s", 791 elf_errmsg(-1)); 792 elf_end(e); 793 return; 794 } 795 796 tabndx = -1; 797 scn = NULL; 798 while ((scn = elf_nextscn(e, scn)) != NULL) { 799 if (gelf_getshdr(scn, &shdr) != &shdr) { 800 bsdar_warnc(bsdar, 0, 801 "elf_getshdr failed: %s", elf_errmsg(-1)); 802 continue; 803 } 804 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) { 805 bsdar_warnc(bsdar, 0, 806 "elf_strptr failed: %s", elf_errmsg(-1)); 807 continue; 808 } 809 if (strcmp(name, ".strtab") == 0) { 810 tabndx = elf_ndxscn(scn); 811 break; 812 } 813 } 814 elferr = elf_errno(); 815 if (elferr != 0) 816 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s", 817 elf_errmsg(elferr)); 818 if (tabndx == -1) { 819 bsdar_warnc(bsdar, 0, "can't find .strtab section"); 820 elf_end(e); 821 return; 822 } 823 824 scn = NULL; 825 while ((scn = elf_nextscn(e, scn)) != NULL) { 826 if (gelf_getshdr(scn, &shdr) != &shdr) { 827 bsdar_warnc(bsdar, EX_SOFTWARE, 0, 828 "elf_getshdr failed: %s", elf_errmsg(-1)); 829 continue; 830 } 831 if (shdr.sh_type != SHT_SYMTAB) 832 continue; 833 834 data = NULL; 835 n = 0; 836 while (n < shdr.sh_size && 837 (data = elf_getdata(scn, data)) != NULL) { 838 len = data->d_size / shdr.sh_entsize; 839 for (i = 0; i < len; i++) { 840 if (gelf_getsym(data, i, &sym) != &sym) { 841 bsdar_warnc(bsdar, EX_SOFTWARE, 0, 842 "gelf_getsym failed: %s", 843 elf_errmsg(-1)); 844 continue; 845 } 846 847 /* keep only global or weak symbols */ 848 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL && 849 GELF_ST_BIND(sym.st_info) != STB_WEAK) 850 continue; 851 852 /* keep only defined symbols */ 853 if (sym.st_shndx == SHN_UNDEF) 854 continue; 855 856 if ((name = elf_strptr(e, tabndx, 857 sym.st_name)) == NULL) { 858 bsdar_warnc(bsdar, EX_SOFTWARE, 0, 859 "elf_strptr failed: %s", 860 elf_errmsg(-1)); 861 continue; 862 } 863 864 add_to_ar_sym_table(bsdar, name); 865 } 866 } 867 } 868 elferr = elf_errno(); 869 if (elferr != 0) 870 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s", 871 elf_errmsg(elferr)); 872 873 elf_end(e); 874} 875 876/* 877 * Append to the archive string table buffer. 878 */ 879static void 880add_to_ar_str_table(struct bsdar *bsdar, const char *name) 881{ 882 883 if (bsdar->as == NULL) { 884 bsdar->as_cap = _INIT_AS_CAP; 885 bsdar->as_sz = 0; 886 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL) 887 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 888 } 889 890 /* 891 * The space required for holding one member name in as table includes: 892 * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding). 893 */ 894 while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) { 895 bsdar->as_cap *= 2; 896 bsdar->as = realloc(bsdar->as, bsdar->as_cap); 897 if (bsdar->as == NULL) 898 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 899 } 900 strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name)); 901 bsdar->as_sz += strlen(name); 902 bsdar->as[bsdar->as_sz++] = '/'; 903 bsdar->as[bsdar->as_sz++] = '\n'; 904} 905 906/* 907 * Append to the archive symbol table buffer. 908 */ 909static void 910add_to_ar_sym_table(struct bsdar *bsdar, const char *name) 911{ 912 913 if (bsdar->s_so == NULL) { 914 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) == 915 NULL) 916 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 917 bsdar->s_so_cap = _INIT_SYMOFF_CAP; 918 bsdar->s_cnt = 0; 919 } 920 921 if (bsdar->s_sn == NULL) { 922 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL) 923 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 924 bsdar->s_sn_cap = _INIT_SYMNAME_CAP; 925 bsdar->s_sn_sz = 0; 926 } 927 928 if (bsdar->s_cnt * sizeof(uint64_t) >= bsdar->s_so_cap) { 929 bsdar->s_so_cap *= 2; 930 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap); 931 if (bsdar->s_so == NULL) 932 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 933 } 934 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off; 935 if ((uint64_t)bsdar->rela_off > bsdar->s_so_max) 936 bsdar->s_so_max = (uint64_t)bsdar->rela_off; 937 bsdar->s_cnt++; 938 939 /* 940 * The space required for holding one symbol name in sn table includes: 941 * strlen(name) + (1 for '\n') + (possibly 1 for padding). 942 */ 943 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) { 944 bsdar->s_sn_cap *= 2; 945 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap); 946 if (bsdar->s_sn == NULL) 947 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 948 } 949 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name)); 950 bsdar->s_sn_sz += strlen(name); 951 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 952} 953