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