1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 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#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 <assert.h> 37#include <errno.h> 38#include <fcntl.h> 39#include <gelf.h> 40#include <libgen.h> 41#include <stdio.h> 42#include <stdlib.h> 43#include <string.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(uint64_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_cleanup(struct bsdar *bsdar); 69static void write_data(struct bsdar *bsdar, struct archive *a, 70 const void *buf, size_t s); 71static void write_objs(struct bsdar *bsdar); 72 73/* 74 * Create object from file, return created obj upon success, or NULL 75 * when an error occurs or the member is not newer than existing 76 * one while -u is specified. 77 */ 78static struct ar_obj * 79create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime) 80{ 81 struct ar_obj *obj; 82 struct stat sb; 83 const char *bname; 84 char *tmpname; 85 86 if (name == NULL) 87 return (NULL); 88 89 obj = malloc(sizeof(struct ar_obj)); 90 if (obj == NULL) 91 bsdar_errc(bsdar, errno, "malloc failed"); 92 if ((obj->fd = open(name, O_RDONLY, 0)) < 0) { 93 bsdar_warnc(bsdar, errno, "can't open file: %s", name); 94 free(obj); 95 return (NULL); 96 } 97 98 tmpname = strdup(name); 99 if (tmpname == NULL) 100 bsdar_errc(bsdar, errno, "strdup failed"); 101 if ((bname = basename(tmpname)) == NULL) 102 bsdar_errc(bsdar, errno, "basename failed"); 103 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) { 104 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL) 105 bsdar_errc(bsdar, errno, "malloc failed"); 106 (void)strncpy(obj->name, bname, _TRUNCATE_LEN); 107 obj->name[_TRUNCATE_LEN] = '\0'; 108 } else 109 if ((obj->name = strdup(bname)) == NULL) 110 bsdar_errc(bsdar, errno, "strdup failed"); 111 free(tmpname); 112 113 if (fstat(obj->fd, &sb) < 0) { 114 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name); 115 goto giveup; 116 } 117 if (!S_ISREG(sb.st_mode)) { 118 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name); 119 goto giveup; 120 } 121 122 /* 123 * When option '-u' is specified and member is not newer than the 124 * existing one, the replacement will not happen. While if mtime == 0, 125 * which indicates that this is to "replace a none exist member", 126 * the replace will proceed regardless of '-u'. 127 */ 128 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime) 129 goto giveup; 130 131 /* 132 * When option '-D' is specified, mtime and UID / GID from the file 133 * will be replaced with 0, and file mode with 644. This ensures that 134 * checksums will match for two archives containing the exact same 135 * files. 136 */ 137 if (bsdar->options & AR_D) { 138 obj->uid = 0; 139 obj->gid = 0; 140 obj->mtime = 0; 141 obj->md = S_IFREG | 0644; 142 } else { 143 obj->uid = sb.st_uid; 144 obj->gid = sb.st_gid; 145 obj->mtime = sb.st_mtime; 146 obj->md = sb.st_mode; 147 } 148 obj->size = sb.st_size; 149 obj->dev = sb.st_dev; 150 obj->ino = sb.st_ino; 151 152 if (obj->size == 0) { 153 obj->maddr = NULL; 154 return (obj); 155 } 156 157 if ((obj->maddr = mmap(NULL, obj->size, PROT_READ, 158 MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) { 159 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name); 160 goto giveup; 161 } 162 if (close(obj->fd) < 0) 163 bsdar_errc(bsdar, errno, "close failed: %s", 164 obj->name); 165 166 return (obj); 167 168giveup: 169 if (close(obj->fd) < 0) 170 bsdar_errc(bsdar, errno, "close failed: %s", 171 obj->name); 172 free(obj->name); 173 free(obj); 174 return (NULL); 175} 176 177/* 178 * Free object itself and its associated allocations. 179 */ 180static void 181free_obj(struct bsdar *bsdar, struct ar_obj *obj) 182{ 183 if (obj->fd == -1) 184 free(obj->maddr); 185 else 186 if (obj->maddr != NULL && munmap(obj->maddr, obj->size)) 187 bsdar_warnc(bsdar, errno, 188 "can't munmap file: %s", obj->name); 189 free(obj->name); 190 free(obj); 191} 192 193/* 194 * Insert obj to the tail, or before/after the pos obj. 195 */ 196static void 197insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos) 198{ 199 if (obj == NULL) 200 bsdar_errc(bsdar, 0, "try to insert a null obj"); 201 202 if (pos == NULL || obj == pos) 203 /* 204 * If the object to move happens to be the position obj, 205 * or if there is not a pos obj, move it to tail. 206 */ 207 goto tail; 208 209 if (bsdar->options & AR_B) { 210 TAILQ_INSERT_BEFORE(pos, obj, objs); 211 return; 212 } 213 if (bsdar->options & AR_A) { 214 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs); 215 return; 216 } 217 218tail: 219 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs); 220 221} 222 223/* 224 * Read objects from archive into v_obj list. Note that checkargv is 225 * set when read_objs is used to read objects from the target of 226 * ADDLIB command (ar script mode), in this case argv array possibly 227 * specifies the members ADDLIB want. 228 */ 229static void 230read_objs(struct bsdar *bsdar, const char *archive, int checkargv) 231{ 232 struct archive *a; 233 struct archive_entry *entry; 234 struct ar_obj *obj; 235 const char *name; 236 const char *bname; 237 char *buff; 238 char **av; 239 size_t size; 240 int i, r, find; 241 242 if ((a = archive_read_new()) == NULL) 243 bsdar_errc(bsdar, 0, "archive_read_new failed"); 244 archive_read_support_format_ar(a); 245 AC(archive_read_open_filename(a, archive, DEF_BLKSZ)); 246 for (;;) { 247 r = archive_read_next_header(a, &entry); 248 if (r == ARCHIVE_FATAL) 249 bsdar_errc(bsdar, archive_errno(a), "%s", 250 archive_error_string(a)); 251 if (r == ARCHIVE_EOF) 252 break; 253 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY) 254 bsdar_warnc(bsdar, archive_errno(a), "%s", 255 archive_error_string(a)); 256 if (r == ARCHIVE_RETRY) { 257 bsdar_warnc(bsdar, 0, "Retrying..."); 258 continue; 259 } 260 261 name = archive_entry_pathname(entry); 262 263 /* 264 * skip pseudo members. 265 */ 266 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0) 267 continue; 268 269 /* 270 * If checkargv is set, only read those members specified 271 * in argv. 272 */ 273 if (checkargv && bsdar->argc > 0) { 274 find = 0; 275 for(i = 0; i < bsdar->argc; i++) { 276 av = &bsdar->argv[i]; 277 if (*av == NULL) 278 continue; 279 if ((bname = basename(*av)) == NULL) 280 bsdar_errc(bsdar, errno, 281 "basename failed"); 282 if (strcmp(bname, name) != 0) 283 continue; 284 285 *av = NULL; 286 find = 1; 287 break; 288 } 289 if (!find) 290 continue; 291 } 292 293 size = archive_entry_size(entry); 294 295 if (size > 0) { 296 if ((buff = malloc(size)) == NULL) 297 bsdar_errc(bsdar, errno, "malloc failed"); 298 if (archive_read_data(a, buff, size) != (ssize_t)size) { 299 bsdar_warnc(bsdar, archive_errno(a), "%s", 300 archive_error_string(a)); 301 free(buff); 302 continue; 303 } 304 } else 305 buff = NULL; 306 307 obj = malloc(sizeof(struct ar_obj)); 308 if (obj == NULL) 309 bsdar_errc(bsdar, errno, "malloc failed"); 310 obj->maddr = buff; 311 if ((obj->name = strdup(name)) == NULL) 312 bsdar_errc(bsdar, errno, "strdup failed"); 313 obj->size = size; 314 obj->uid = archive_entry_uid(entry); 315 obj->gid = archive_entry_gid(entry); 316 obj->md = archive_entry_mode(entry); 317 obj->mtime = archive_entry_mtime(entry); 318 obj->dev = 0; 319 obj->ino = 0; 320 321 /* 322 * Objects from archive have obj->fd set to -1, 323 * for the ease of cleaning up. 324 */ 325 obj->fd = -1; 326 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs); 327 } 328 AC(archive_read_close(a)); 329 AC(archive_read_free(a)); 330} 331 332/* 333 * Determine the constitution of resulting archive. 334 */ 335int 336ar_write_archive(struct bsdar *bsdar, int mode) 337{ 338 struct ar_obj *nobj, *obj, *obj_temp, *pos; 339 struct stat sb; 340 const char *bname; 341 char **av; 342 int exitcode, i; 343 344 TAILQ_INIT(&bsdar->v_obj); 345 exitcode = EXIT_SUCCESS; 346 nobj = NULL; 347 pos = NULL; 348 memset(&sb, 0, sizeof(sb)); 349 350 assert(mode == 'A' || mode == 'd' || mode == 'm' || mode == 'q' || 351 mode == 'r' || mode == 's'); 352 353 /* 354 * Test if the specified archive exists, to figure out 355 * whether we are creating one here. 356 */ 357 if (stat(bsdar->filename, &sb) != 0) { 358 if (errno != ENOENT) { 359 bsdar_warnc(bsdar, 0, "stat %s failed", 360 bsdar->filename); 361 return (EXIT_FAILURE); 362 } 363 364 /* We do not create archive in mode 'd', 'm' and 's'. */ 365 if (mode != 'r' && mode != 'q') { 366 bsdar_warnc(bsdar, 0, "%s: no such file", 367 bsdar->filename); 368 return (EXIT_FAILURE); 369 } 370 371 /* Issue a warning if -c is not specified when creating. */ 372 if (!(bsdar->options & AR_C)) 373 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename); 374 goto new_archive; 375 } 376 377 /* 378 * First read members from existing archive. 379 */ 380 read_objs(bsdar, bsdar->filename, 0); 381 382 /* 383 * For mode 's', no member will be moved, deleted or replaced. 384 */ 385 if (mode == 's') 386 goto write_objs; 387 388 /* 389 * For mode 'q', we don't need to adjust existing members either. 390 * Also, -a, -b and -i are ignored in this mode. New members are 391 * always inserted at tail. 392 */ 393 if (mode == 'q') 394 goto new_archive; 395 396 /* 397 * Mode 'A' adds the contents of another archive to the tail of 398 * current archive. Note that mode 'A' is a special mode for the 399 * ADDLIB command of the ar script mode. Currently there is no 400 * access to this function from the ar command line mode. 401 */ 402 if (mode == 'A') { 403 /* 404 * Read objects from the target archive of ADDLIB command. 405 * If there are members specified in argv, read those members 406 * only, otherwise the entire archive will be read. 407 */ 408 read_objs(bsdar, bsdar->addlib, 1); 409 goto write_objs; 410 } 411 412 /* 413 * Try to find the position member specified by user. 414 */ 415 if (bsdar->options & AR_A || bsdar->options & AR_B) { 416 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 417 if (strcmp(obj->name, bsdar->posarg) == 0) { 418 pos = obj; 419 break; 420 } 421 } 422 423 /* 424 * If can't find `pos' specified by user, 425 * silently insert objects at tail. 426 */ 427 if (pos == NULL) 428 bsdar->options &= ~(AR_A | AR_B); 429 } 430 431 for (i = 0; i < bsdar->argc; i++) { 432 av = &bsdar->argv[i]; 433 434 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 435 if ((bname = basename(*av)) == NULL) 436 bsdar_errc(bsdar, errno, "basename failed"); 437 if (bsdar->options & AR_TR) { 438 if (strncmp(bname, obj->name, _TRUNCATE_LEN)) 439 continue; 440 } else 441 if (strcmp(bname, obj->name) != 0) 442 continue; 443 444 if (mode == 'r') { 445 /* 446 * if the new member is not qualified 447 * to replace the old one, skip it. 448 */ 449 nobj = create_obj_from_file(bsdar, *av, 450 obj->mtime); 451 if (nobj == NULL) { 452 exitcode = EXIT_FAILURE; 453 goto skip_obj; 454 } 455 } 456 457 if (bsdar->options & AR_V) 458 (void)fprintf(stdout, "%c - %s\n", mode, 459 *av); 460 461 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 462 if (mode == 'd' || mode == 'r') 463 free_obj(bsdar, obj); 464 465 if (mode == 'm') 466 insert_obj(bsdar, obj, pos); 467 if (mode == 'r') 468 insert_obj(bsdar, nobj, pos); 469 470 skip_obj: 471 *av = NULL; 472 break; 473 } 474 475 } 476 477new_archive: 478 /* 479 * When operating in mode 'r', directly add those user specified 480 * objects which do not exist in current archive. When operating 481 * in mode 'q', all objects specified in command line args are 482 * appended to the archive, without comparing with existing ones. 483 */ 484 for (i = 0; i < bsdar->argc; i++) { 485 av = &bsdar->argv[i]; 486 if (*av != NULL && (mode == 'r' || mode == 'q')) { 487 nobj = create_obj_from_file(bsdar, *av, 0); 488 if (nobj == NULL) { 489 exitcode = EXIT_FAILURE; 490 *av = NULL; 491 continue; 492 } 493 insert_obj(bsdar, nobj, pos); 494 if (bsdar->options & AR_V && nobj != NULL) 495 (void)fprintf(stdout, "a - %s\n", *av); 496 *av = NULL; 497 } 498 } 499 500write_objs: 501 write_objs(bsdar); 502 write_cleanup(bsdar); 503 504 return (exitcode); 505} 506 507/* 508 * Memory cleaning up. 509 */ 510static void 511write_cleanup(struct bsdar *bsdar) 512{ 513 struct ar_obj *obj, *obj_temp; 514 515 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 516 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 517 free_obj(bsdar, obj); 518 } 519 520 free(bsdar->as); 521 free(bsdar->s_so); 522 free(bsdar->s_sn); 523 bsdar->as = NULL; 524 bsdar->s_so = NULL; 525 bsdar->s_so_max = 0; 526 bsdar->s_sn = NULL; 527} 528 529/* 530 * Fault in the buffer prior to writing as a workaround for poor performance 531 * due to interaction with kernel fs deadlock avoidance code. See the comment 532 * above vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the issue. 533 */ 534static void 535prefault_buffer(const char *buf, size_t s) 536{ 537 volatile const char *p; 538 size_t page_size; 539 540 if (s == 0) 541 return; 542 page_size = sysconf(_SC_PAGESIZE); 543 for (p = buf; p < buf + s; p += page_size) 544 *p; 545 /* 546 * Ensure we touch the last page as well, in case the buffer is not 547 * page-aligned. 548 */ 549 *(volatile const char *)(buf + s - 1); 550} 551 552/* 553 * Wrapper for archive_write_data(). 554 */ 555static void 556write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s) 557{ 558 ssize_t written; 559 560 prefault_buffer(buf, s); 561 while (s > 0) { 562 written = archive_write_data(a, buf, s); 563 if (written < 0) 564 bsdar_errc(bsdar, archive_errno(a), "%s", 565 archive_error_string(a)); 566 buf = (const char *)buf + written; 567 s -= written; 568 } 569} 570 571/* 572 * Write the resulting archive members. 573 */ 574static void 575write_objs(struct bsdar *bsdar) 576{ 577 struct ar_obj *obj; 578 struct archive *a; 579 struct archive_entry *entry; 580 size_t s_sz; /* size of archive symbol table. */ 581 size_t pm_sz; /* size of pseudo members */ 582 size_t w_sz; /* size of words in symbol table */ 583 size_t i; 584 uint64_t nr; 585 uint32_t nr32; 586 587 if (elf_version(EV_CURRENT) == EV_NONE) 588 bsdar_errc(bsdar, 0, "ELF library initialization failed: %s", 589 elf_errmsg(-1)); 590 591 bsdar->rela_off = 0; 592 593 /* Create archive symbol table and archive string table, if need. */ 594 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 595 if (!(bsdar->options & AR_SS) && obj->maddr != NULL) 596 create_symtab_entry(bsdar, obj->maddr, obj->size); 597 if (strlen(obj->name) > _MAXNAMELEN_SVR4) 598 add_to_ar_str_table(bsdar, obj->name); 599 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2; 600 } 601 602 /* 603 * Pad the symbol name string table. It is treated specially because 604 * symbol name table should be padded by a '\0', not the common '\n' 605 * for other members. The size of sn table includes the pad bit. 606 */ 607 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0) 608 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 609 610 /* 611 * Archive string table is padded by a "\n" as the normal members. 612 * The difference is that the size of archive string table counts 613 * in the pad bit, while normal members' size fields do not. 614 */ 615 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0) 616 bsdar->as[bsdar->as_sz++] = '\n'; 617 618 /* 619 * If there is a symbol table, calculate the size of pseudo members, 620 * convert previously stored relative offsets to absolute ones, and 621 * then make them Big Endian. 622 * 623 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members) 624 */ 625 w_sz = sizeof(uint32_t); 626 if (bsdar->s_cnt != 0) { 627 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz; 628 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz); 629 if (bsdar->as != NULL) 630 pm_sz += _ARHDR_LEN + bsdar->as_sz; 631 /* Use the 64-bit word size format if necessary. */ 632 if (bsdar->s_so_max > UINT32_MAX - pm_sz) { 633 w_sz = sizeof(uint64_t); 634 pm_sz -= s_sz; 635 s_sz = (bsdar->s_cnt + 1) * sizeof(uint64_t) + 636 bsdar->s_sn_sz; 637 pm_sz += s_sz; 638 /* Convert to big-endian. */ 639 for (i = 0; i < bsdar->s_cnt; i++) 640 bsdar->s_so[i] = 641 htobe64(bsdar->s_so[i] + pm_sz); 642 } else { 643 /* 644 * Convert to big-endian and shuffle in-place to 645 * the front of the allocation. XXX UB 646 */ 647 for (i = 0; i < bsdar->s_cnt; i++) 648 ((uint32_t *)(bsdar->s_so))[i] = 649 htobe32(bsdar->s_so[i] + pm_sz); 650 } 651 } 652 653 if ((a = archive_write_new()) == NULL) 654 bsdar_errc(bsdar, 0, "archive_write_new failed"); 655 656 archive_write_set_format_ar_svr4(a); 657 658 AC(archive_write_open_filename(a, bsdar->filename)); 659 660 /* 661 * write the archive symbol table, if there is one. 662 * If options -s is explicitly specified or we are invoked 663 * as ranlib, write the symbol table even if it is empty. 664 */ 665 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) || 666 bsdar->options & AR_S) { 667 entry = archive_entry_new(); 668 if (entry == NULL) 669 bsdar_errc(bsdar, 0, "archive_entry_new failed"); 670 if (w_sz == sizeof(uint64_t)) 671 archive_entry_copy_pathname(entry, "/SYM64/"); 672 else 673 archive_entry_copy_pathname(entry, "/"); 674 if ((bsdar->options & AR_D) == 0) 675 archive_entry_set_mtime(entry, time(NULL), 0); 676 archive_entry_set_size(entry, (bsdar->s_cnt + 1) * w_sz + 677 bsdar->s_sn_sz); 678 AC(archive_write_header(a, entry)); 679 if (w_sz == sizeof(uint64_t)) { 680 nr = htobe64(bsdar->s_cnt); 681 write_data(bsdar, a, &nr, sizeof(nr)); 682 } else { 683 nr32 = htobe32((uint32_t)bsdar->s_cnt); 684 write_data(bsdar, a, &nr32, sizeof(nr32)); 685 } 686 write_data(bsdar, a, bsdar->s_so, w_sz * bsdar->s_cnt); 687 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz); 688 archive_entry_free(entry); 689 } 690 691 /* write the archive string table, if any. */ 692 if (bsdar->as != NULL) { 693 entry = archive_entry_new(); 694 if (entry == NULL) 695 bsdar_errc(bsdar, 0, "archive_entry_new failed"); 696 archive_entry_copy_pathname(entry, "//"); 697 archive_entry_set_size(entry, bsdar->as_sz); 698 AC(archive_write_header(a, entry)); 699 write_data(bsdar, a, bsdar->as, bsdar->as_sz); 700 archive_entry_free(entry); 701 } 702 703 /* write normal members. */ 704 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 705 entry = archive_entry_new(); 706 if (entry == NULL) 707 bsdar_errc(bsdar, 0, "archive_entry_new failed"); 708 archive_entry_copy_pathname(entry, obj->name); 709 archive_entry_set_uid(entry, obj->uid); 710 archive_entry_set_gid(entry, obj->gid); 711 archive_entry_set_mode(entry, obj->md); 712 archive_entry_set_size(entry, obj->size); 713 archive_entry_set_mtime(entry, obj->mtime, 0); 714 archive_entry_set_dev(entry, obj->dev); 715 archive_entry_set_ino(entry, obj->ino); 716 archive_entry_set_filetype(entry, AE_IFREG); 717 AC(archive_write_header(a, entry)); 718 write_data(bsdar, a, obj->maddr, obj->size); 719 archive_entry_free(entry); 720 } 721 722 AC(archive_write_close(a)); 723 AC(archive_write_free(a)); 724} 725 726/* 727 * Extract global symbols from ELF binary members. 728 */ 729static void 730create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size) 731{ 732 Elf *e; 733 Elf_Scn *scn; 734 GElf_Shdr shdr; 735 GElf_Sym sym; 736 Elf_Data *data; 737 char *name; 738 size_t n, shstrndx; 739 int elferr, tabndx, len, i; 740 741 if ((e = elf_memory(maddr, size)) == NULL) { 742 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s", 743 elf_errmsg(-1)); 744 return; 745 } 746 if (elf_kind(e) != ELF_K_ELF) { 747 /* Silently ignore non-elf member. */ 748 elf_end(e); 749 return; 750 } 751 if (elf_getshstrndx(e, &shstrndx) == 0) { 752 bsdar_warnc(bsdar, 0, "elf_getshstrndx failed: %s", 753 elf_errmsg(-1)); 754 elf_end(e); 755 return; 756 } 757 758 tabndx = -1; 759 scn = NULL; 760 while ((scn = elf_nextscn(e, scn)) != NULL) { 761 if (gelf_getshdr(scn, &shdr) != &shdr) { 762 bsdar_warnc(bsdar, 0, 763 "elf_getshdr failed: %s", elf_errmsg(-1)); 764 continue; 765 } 766 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) { 767 bsdar_warnc(bsdar, 0, 768 "elf_strptr failed: %s", elf_errmsg(-1)); 769 continue; 770 } 771 if (strcmp(name, ".strtab") == 0) { 772 tabndx = elf_ndxscn(scn); 773 break; 774 } 775 } 776 elferr = elf_errno(); 777 if (elferr != 0) 778 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s", 779 elf_errmsg(elferr)); 780 if (tabndx == -1) { 781 bsdar_warnc(bsdar, 0, "can't find .strtab section"); 782 elf_end(e); 783 return; 784 } 785 786 scn = NULL; 787 while ((scn = elf_nextscn(e, scn)) != NULL) { 788 if (gelf_getshdr(scn, &shdr) != &shdr) { 789 bsdar_warnc(bsdar, 0, "elf_getshdr failed: %s", 790 elf_errmsg(-1)); 791 continue; 792 } 793 if (shdr.sh_type != SHT_SYMTAB) 794 continue; 795 796 data = NULL; 797 n = 0; 798 while (n < shdr.sh_size && 799 (data = elf_getdata(scn, data)) != NULL) { 800 len = data->d_size / shdr.sh_entsize; 801 for (i = 0; i < len; i++) { 802 if (gelf_getsym(data, i, &sym) != &sym) { 803 bsdar_warnc(bsdar, 0, 804 "gelf_getsym failed: %s", 805 elf_errmsg(-1)); 806 continue; 807 } 808 809 /* keep only global or weak symbols */ 810 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL && 811 GELF_ST_BIND(sym.st_info) != STB_WEAK) 812 continue; 813 814 /* keep only defined symbols */ 815 if (sym.st_shndx == SHN_UNDEF) 816 continue; 817 818 if ((name = elf_strptr(e, tabndx, 819 sym.st_name)) == NULL) { 820 bsdar_warnc(bsdar, 0, 821 "elf_strptr failed: %s", 822 elf_errmsg(-1)); 823 continue; 824 } 825 826 add_to_ar_sym_table(bsdar, name); 827 } 828 } 829 } 830 elferr = elf_errno(); 831 if (elferr != 0) 832 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s", 833 elf_errmsg(elferr)); 834 835 elf_end(e); 836} 837 838/* 839 * Append to the archive string table buffer. 840 */ 841static void 842add_to_ar_str_table(struct bsdar *bsdar, const char *name) 843{ 844 845 if (bsdar->as == NULL) { 846 bsdar->as_cap = _INIT_AS_CAP; 847 bsdar->as_sz = 0; 848 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL) 849 bsdar_errc(bsdar, errno, "malloc failed"); 850 } 851 852 /* 853 * The space required for holding one member name in as table includes: 854 * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding). 855 */ 856 while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) { 857 bsdar->as_cap *= 2; 858 bsdar->as = realloc(bsdar->as, bsdar->as_cap); 859 if (bsdar->as == NULL) 860 bsdar_errc(bsdar, errno, "realloc failed"); 861 } 862 strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name)); 863 bsdar->as_sz += strlen(name); 864 bsdar->as[bsdar->as_sz++] = '/'; 865 bsdar->as[bsdar->as_sz++] = '\n'; 866} 867 868/* 869 * Append to the archive symbol table buffer. 870 */ 871static void 872add_to_ar_sym_table(struct bsdar *bsdar, const char *name) 873{ 874 875 if (bsdar->s_so == NULL) { 876 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) == 877 NULL) 878 bsdar_errc(bsdar, errno, "malloc failed"); 879 bsdar->s_so_cap = _INIT_SYMOFF_CAP; 880 bsdar->s_cnt = 0; 881 } 882 883 if (bsdar->s_sn == NULL) { 884 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL) 885 bsdar_errc(bsdar, errno, "malloc failed"); 886 bsdar->s_sn_cap = _INIT_SYMNAME_CAP; 887 bsdar->s_sn_sz = 0; 888 } 889 890 if (bsdar->s_cnt * sizeof(uint64_t) >= bsdar->s_so_cap) { 891 bsdar->s_so_cap *= 2; 892 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap); 893 if (bsdar->s_so == NULL) 894 bsdar_errc(bsdar, errno, "realloc failed"); 895 } 896 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off; 897 if ((uint64_t)bsdar->rela_off > bsdar->s_so_max) 898 bsdar->s_so_max = (uint64_t)bsdar->rela_off; 899 bsdar->s_cnt++; 900 901 /* 902 * The space required for holding one symbol name in sn table includes: 903 * strlen(name) + (1 for '\n') + (possibly 1 for padding). 904 */ 905 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) { 906 bsdar->s_sn_cap *= 2; 907 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap); 908 if (bsdar->s_sn == NULL) 909 bsdar_errc(bsdar, errno, "realloc failed"); 910 } 911 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name)); 912 bsdar->s_sn_sz += strlen(name); 913 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 914} 915