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: releng/11.0/usr.bin/ar/write.c 300741 2016-05-26 13:49:40Z ed $"); 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 char *tmpname; 128 129 if (name == NULL) 130 return (NULL); 131 132 obj = malloc(sizeof(struct ar_obj)); 133 if (obj == NULL) 134 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 135 if ((obj->fd = open(name, O_RDONLY, 0)) < 0) { 136 bsdar_warnc(bsdar, errno, "can't open file: %s", name); 137 free(obj); 138 return (NULL); 139 } 140 141 tmpname = strdup(name); 142 if (tmpname == NULL) 143 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed"); 144 if ((bname = basename(tmpname)) == NULL) 145 bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed"); 146 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) { 147 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL) 148 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 149 (void)strncpy(obj->name, bname, _TRUNCATE_LEN); 150 obj->name[_TRUNCATE_LEN] = '\0'; 151 } else 152 if ((obj->name = strdup(bname)) == NULL) 153 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed"); 154 free(tmpname); 155 156 if (fstat(obj->fd, &sb) < 0) { 157 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name); 158 goto giveup; 159 } 160 if (!S_ISREG(sb.st_mode)) { 161 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name); 162 goto giveup; 163 } 164 165 /* 166 * When option '-u' is specified and member is not newer than the 167 * existing one, the replace will not happen. While if mtime == 0, 168 * which indicates that this is to "replace a none exist member", 169 * the replace will proceed regardless of '-u'. 170 */ 171 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime) 172 goto giveup; 173 174 /* 175 * When option '-D' is specified, mtime and UID / GID from the file 176 * will be replaced with 0, and file mode with 644. This ensures that 177 * checksums will match for two archives containing the exact same 178 * files. 179 */ 180 if (bsdar->options & AR_D) { 181 obj->uid = 0; 182 obj->gid = 0; 183 obj->mtime = 0; 184 obj->md = S_IFREG | 0644; 185 } else { 186 obj->uid = sb.st_uid; 187 obj->gid = sb.st_gid; 188 obj->mtime = sb.st_mtime; 189 obj->md = sb.st_mode; 190 } 191 obj->size = sb.st_size; 192 obj->dev = sb.st_dev; 193 obj->ino = sb.st_ino; 194 195 if (obj->size == 0) { 196 obj->maddr = NULL; 197 return (obj); 198 } 199 200 if ((obj->maddr = mmap(NULL, obj->size, PROT_READ, 201 MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) { 202 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name); 203 goto giveup; 204 } 205 if (close(obj->fd) < 0) 206 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s", 207 obj->name); 208 209 return (obj); 210 211giveup: 212 if (close(obj->fd) < 0) 213 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s", 214 obj->name); 215 free(obj->name); 216 free(obj); 217 return (NULL); 218} 219 220/* 221 * Free object itself and its associated allocations. 222 */ 223static void 224free_obj(struct bsdar *bsdar, struct ar_obj *obj) 225{ 226 if (obj->fd == -1) 227 free(obj->maddr); 228 else 229 if (obj->maddr != NULL && munmap(obj->maddr, obj->size)) 230 bsdar_warnc(bsdar, errno, 231 "can't munmap file: %s", obj->name); 232 free(obj->name); 233 free(obj); 234} 235 236/* 237 * Insert obj to the tail, or before/after the pos obj. 238 */ 239static void 240insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos) 241{ 242 if (obj == NULL) 243 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj"); 244 245 if (pos == NULL || obj == pos) 246 /* 247 * If the object to move happens to be the position obj, 248 * or if there is not a pos obj, move it to tail. 249 */ 250 goto tail; 251 252 if (bsdar->options & AR_B) { 253 TAILQ_INSERT_BEFORE(pos, obj, objs); 254 return; 255 } 256 if (bsdar->options & AR_A) { 257 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs); 258 return; 259 } 260 261tail: 262 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs); 263 264} 265 266/* 267 * Read objects from archive into v_obj list. Note that checkargv is 268 * set when read_objs is used to read objects from the target of 269 * ADDLIB command (ar script mode), in this case argv array possibly 270 * specifies the members ADDLIB want. 271 */ 272static void 273read_objs(struct bsdar *bsdar, const char *archive, int checkargv) 274{ 275 struct archive *a; 276 struct archive_entry *entry; 277 struct ar_obj *obj; 278 const char *name; 279 const char *bname; 280 char *buff; 281 char **av; 282 size_t size; 283 int i, r, find; 284 285 if ((a = archive_read_new()) == NULL) 286 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed"); 287 archive_read_support_format_ar(a); 288 AC(archive_read_open_filename(a, archive, DEF_BLKSZ)); 289 for (;;) { 290 r = archive_read_next_header(a, &entry); 291 if (r == ARCHIVE_FATAL) 292 bsdar_errc(bsdar, EX_DATAERR, 0, "%s", 293 archive_error_string(a)); 294 if (r == ARCHIVE_EOF) 295 break; 296 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY) 297 bsdar_warnc(bsdar, 0, "%s", archive_error_string(a)); 298 if (r == ARCHIVE_RETRY) { 299 bsdar_warnc(bsdar, 0, "Retrying..."); 300 continue; 301 } 302 303 name = archive_entry_pathname(entry); 304 305 /* 306 * skip pseudo members. 307 */ 308 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0) 309 continue; 310 311 /* 312 * If checkargv is set, only read those members specified 313 * in argv. 314 */ 315 if (checkargv && bsdar->argc > 0) { 316 find = 0; 317 for(i = 0; i < bsdar->argc; i++) { 318 av = &bsdar->argv[i]; 319 if (*av == NULL) 320 continue; 321 if ((bname = basename(*av)) == NULL) 322 bsdar_errc(bsdar, EX_SOFTWARE, errno, 323 "basename failed"); 324 if (strcmp(bname, name) != 0) 325 continue; 326 327 *av = NULL; 328 find = 1; 329 break; 330 } 331 if (!find) 332 continue; 333 } 334 335 size = archive_entry_size(entry); 336 337 if (size > 0) { 338 if ((buff = malloc(size)) == NULL) 339 bsdar_errc(bsdar, EX_SOFTWARE, errno, 340 "malloc failed"); 341 if (archive_read_data(a, buff, size) != (ssize_t)size) { 342 bsdar_warnc(bsdar, 0, "%s", 343 archive_error_string(a)); 344 free(buff); 345 continue; 346 } 347 } else 348 buff = NULL; 349 350 obj = malloc(sizeof(struct ar_obj)); 351 if (obj == NULL) 352 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 353 obj->maddr = buff; 354 if ((obj->name = strdup(name)) == NULL) 355 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed"); 356 obj->size = size; 357 obj->uid = archive_entry_uid(entry); 358 obj->gid = archive_entry_gid(entry); 359 obj->md = archive_entry_mode(entry); 360 obj->mtime = archive_entry_mtime(entry); 361 obj->dev = 0; 362 obj->ino = 0; 363 364 /* 365 * Objects from archive have obj->fd set to -1, 366 * for the ease of cleaning up. 367 */ 368 obj->fd = -1; 369 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs); 370 } 371 AC(archive_read_close(a)); 372 AC(archive_read_free(a)); 373} 374 375/* 376 * Determine the constitution of resulting archive. 377 */ 378static void 379write_archive(struct bsdar *bsdar, char mode) 380{ 381 struct ar_obj *nobj, *obj, *obj_temp, *pos; 382 struct stat sb; 383 const char *bname; 384 char **av; 385 int i; 386 387 TAILQ_INIT(&bsdar->v_obj); 388 nobj = NULL; 389 pos = NULL; 390 memset(&sb, 0, sizeof(sb)); 391 392 /* 393 * Test if the specified archive exists, to figure out 394 * whether we are creating one here. 395 */ 396 if (stat(bsdar->filename, &sb) != 0) { 397 if (errno != ENOENT) { 398 bsdar_warnc(bsdar, 0, "stat %s failed", 399 bsdar->filename); 400 return; 401 } 402 403 /* We do not create archive in mode 'd', 'm' and 's'. */ 404 if (mode != 'r' && mode != 'q') { 405 bsdar_warnc(bsdar, 0, "%s: no such file", 406 bsdar->filename); 407 return; 408 } 409 410 /* Issue a warning if -c is not specified when creating. */ 411 if (!(bsdar->options & AR_C)) 412 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename); 413 goto new_archive; 414 } 415 416 /* 417 * First read members from existing archive. 418 */ 419 read_objs(bsdar, bsdar->filename, 0); 420 421 /* 422 * For mode 's', no member will be moved, deleted or replaced. 423 */ 424 if (mode == 's') 425 goto write_objs; 426 427 /* 428 * For mode 'q', we don't need to adjust existing members either. 429 * Also, -a, -b and -i are ignored in this mode. New members are 430 * always inserted at tail. 431 */ 432 if (mode == 'q') 433 goto new_archive; 434 435 /* 436 * Mode 'A' adds the contents of another archive to the tail of 437 * current archive. Note that mode 'A' is a special mode for the 438 * ADDLIB command of the ar script mode. Currently there is no 439 * access to this function from the ar command line mode. 440 */ 441 if (mode == 'A') { 442 /* 443 * Read objects from the target archive of ADDLIB command. 444 * If there are members specified in argv, read those members 445 * only, otherwise the entire archive will be read. 446 */ 447 read_objs(bsdar, bsdar->addlib, 1); 448 goto write_objs; 449 } 450 451 /* 452 * Try to find the position member specified by user. 453 */ 454 if (bsdar->options & AR_A || bsdar->options & AR_B) { 455 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 456 if (strcmp(obj->name, bsdar->posarg) == 0) { 457 pos = obj; 458 break; 459 } 460 } 461 462 /* 463 * If can't find `pos' specified by user, 464 * silently insert objects at tail. 465 */ 466 if (pos == NULL) 467 bsdar->options &= ~(AR_A | AR_B); 468 } 469 470 for (i = 0; i < bsdar->argc; i++) { 471 av = &bsdar->argv[i]; 472 473 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 474 if ((bname = basename(*av)) == NULL) 475 bsdar_errc(bsdar, EX_SOFTWARE, errno, 476 "basename failed"); 477 if (bsdar->options & AR_TR) { 478 if (strncmp(bname, obj->name, _TRUNCATE_LEN)) 479 continue; 480 } else 481 if (strcmp(bname, obj->name) != 0) 482 continue; 483 484 if (mode == 'r') { 485 /* 486 * if the new member is not qualified 487 * to replace the old one, skip it. 488 */ 489 nobj = create_obj_from_file(bsdar, *av, 490 obj->mtime); 491 if (nobj == NULL) 492 goto skip_obj; 493 } 494 495 if (bsdar->options & AR_V) 496 (void)fprintf(stdout, "%c - %s\n", mode, 497 *av); 498 499 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 500 if (mode == 'd' || mode == 'r') 501 free_obj(bsdar, obj); 502 503 if (mode == 'm') 504 insert_obj(bsdar, obj, pos); 505 if (mode == 'r') 506 insert_obj(bsdar, nobj, pos); 507 508 skip_obj: 509 *av = NULL; 510 break; 511 } 512 513 } 514 515new_archive: 516 /* 517 * When operating in mode 'r', directly add those user specified 518 * objects which do not exist in current archive. When operating 519 * in mode 'q', all objects specified in command line args are 520 * appended to the archive, without comparing with existing ones. 521 */ 522 for (i = 0; i < bsdar->argc; i++) { 523 av = &bsdar->argv[i]; 524 if (*av != NULL && (mode == 'r' || mode == 'q')) { 525 nobj = create_obj_from_file(bsdar, *av, 0); 526 if (nobj != NULL) 527 insert_obj(bsdar, nobj, pos); 528 if (bsdar->options & AR_V && nobj != NULL) 529 (void)fprintf(stdout, "a - %s\n", *av); 530 *av = NULL; 531 } 532 } 533 534write_objs: 535 write_objs(bsdar); 536 write_cleanup(bsdar); 537} 538 539/* 540 * Memory cleaning up. 541 */ 542static void 543write_cleanup(struct bsdar *bsdar) 544{ 545 struct ar_obj *obj, *obj_temp; 546 547 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 548 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 549 free_obj(bsdar, obj); 550 } 551 552 free(bsdar->as); 553 free(bsdar->s_so); 554 free(bsdar->s_sn); 555 bsdar->as = NULL; 556 bsdar->s_so = NULL; 557 bsdar->s_sn = NULL; 558} 559 560/* 561 * Fault in the buffer prior to writing as a workaround for poor performance 562 * due to interaction with kernel fs deadlock avoidance code. See the comment 563 * above vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the issue. 564 */ 565static void 566prefault_buffer(const char *buf, size_t s) 567{ 568 volatile const char *p; 569 size_t page_size; 570 571 if (s == 0) 572 return; 573 page_size = sysconf(_SC_PAGESIZE); 574 for (p = buf; p < buf + s; p += page_size) 575 *p; 576 /* 577 * Ensure we touch the last page as well, in case the buffer is not 578 * page-aligned. 579 */ 580 *(volatile const char *)(buf + s - 1); 581} 582 583/* 584 * Wrapper for archive_write_data(). 585 */ 586static void 587write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s) 588{ 589 prefault_buffer(buf, s); 590 if (archive_write_data(a, buf, s) != (ssize_t)s) 591 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s", 592 archive_error_string(a)); 593} 594 595/* 596 * Write the resulting archive members. 597 */ 598static void 599write_objs(struct bsdar *bsdar) 600{ 601 struct ar_obj *obj; 602 struct archive *a; 603 struct archive_entry *entry; 604 size_t s_sz; /* size of archive symbol table. */ 605 size_t pm_sz; /* size of pseudo members */ 606 int i, nr; 607 608 if (elf_version(EV_CURRENT) == EV_NONE) 609 bsdar_errc(bsdar, EX_SOFTWARE, 0, 610 "ELF library initialization failed: %s", elf_errmsg(-1)); 611 612 bsdar->rela_off = 0; 613 614 /* Create archive symbol table and archive string table, if need. */ 615 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 616 if (!(bsdar->options & AR_SS) && obj->maddr != NULL) 617 create_symtab_entry(bsdar, obj->maddr, obj->size); 618 if (strlen(obj->name) > _MAXNAMELEN_SVR4) 619 add_to_ar_str_table(bsdar, obj->name); 620 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2; 621 } 622 623 /* 624 * Pad the symbol name string table. It is treated specially because 625 * symbol name table should be padded by a '\0', not the common '\n' 626 * for other members. The size of sn table includes the pad bit. 627 */ 628 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0) 629 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 630 631 /* 632 * Archive string table is padded by a "\n" as the normal members. 633 * The difference is that the size of archive string table counts 634 * in the pad bit, while normal members' size fileds do not. 635 */ 636 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0) 637 bsdar->as[bsdar->as_sz++] = '\n'; 638 639 /* 640 * If there is a symbol table, calculate the size of pseudo members, 641 * convert previously stored relative offsets to absolute ones, and 642 * then make them Big Endian. 643 * 644 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members) 645 */ 646 647 if (bsdar->s_cnt != 0) { 648 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz; 649 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz); 650 if (bsdar->as != NULL) 651 pm_sz += _ARHDR_LEN + bsdar->as_sz; 652 for (i = 0; (size_t)i < bsdar->s_cnt; i++) 653 *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) + 654 pm_sz); 655 } 656 657 if ((a = archive_write_new()) == NULL) 658 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed"); 659 660 archive_write_set_format_ar_svr4(a); 661 662 AC(archive_write_open_filename(a, bsdar->filename)); 663 664 /* 665 * write the archive symbol table, if there is one. 666 * If options -s is explicitly specified or we are invoked 667 * as ranlib, write the symbol table even if it is empty. 668 */ 669 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) || 670 bsdar->options & AR_S) { 671 entry = archive_entry_new(); 672 if (entry == NULL) 673 bsdar_errc(bsdar, EX_SOFTWARE, 0, 674 "archive_entry_new failed"); 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) * 679 sizeof(uint32_t) + bsdar->s_sn_sz); 680 AC(archive_write_header(a, entry)); 681 nr = htobe32(bsdar->s_cnt); 682 write_data(bsdar, a, &nr, sizeof(uint32_t)); 683 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) * 684 bsdar->s_cnt); 685 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz); 686 archive_entry_free(entry); 687 } 688 689 /* write the archive string table, if any. */ 690 if (bsdar->as != NULL) { 691 entry = archive_entry_new(); 692 if (entry == NULL) 693 bsdar_errc(bsdar, EX_SOFTWARE, 0, 694 "archive_entry_new failed"); 695 archive_entry_copy_pathname(entry, "//"); 696 archive_entry_set_size(entry, bsdar->as_sz); 697 AC(archive_write_header(a, entry)); 698 write_data(bsdar, a, bsdar->as, bsdar->as_sz); 699 archive_entry_free(entry); 700 } 701 702 /* write normal members. */ 703 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 704 entry = archive_entry_new(); 705 if (entry == NULL) 706 bsdar_errc(bsdar, EX_SOFTWARE, 0, 707 "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, EX_SOFTWARE, 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, EX_SOFTWARE, 0, 790 "elf_getshdr failed: %s", 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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(uint32_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, EX_SOFTWARE, errno, "realloc failed"); 895 } 896 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off; 897 bsdar->s_cnt++; 898 899 /* 900 * The space required for holding one symbol name in sn table includes: 901 * strlen(name) + (1 for '\n') + (possibly 1 for padding). 902 */ 903 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) { 904 bsdar->s_sn_cap *= 2; 905 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap); 906 if (bsdar->s_sn == NULL) 907 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 908 } 909 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name)); 910 bsdar->s_sn_sz += strlen(name); 911 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 912} 913