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