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