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 write_archive(struct bsdar *bsdar, char mode); 64 static void write_cleanup(struct bsdar *bsdar); 65 static void write_data(struct bsdar *bsdar, struct archive *a, 66 const void *buf, size_t s); 67 static void write_objs(struct bsdar *bsdar); 68 69 void 70 ar_mode_d(struct bsdar *bsdar) 71 { 72 73 write_archive(bsdar, 'd'); 74 } 75 76 void 77 ar_mode_m(struct bsdar *bsdar) 78 { 79 80 write_archive(bsdar, 'm'); 81 } 82 83 void 84 ar_mode_r(struct bsdar *bsdar) 85 { 86 87 write_archive(bsdar, 'r'); 88 } 89 90 void 91 ar_mode_s(struct bsdar *bsdar) 92 { 93 94 write_archive(bsdar, 's'); 95 } 96 97 /* 98 * Create object from file, return created obj upon success, or NULL 99 * when an error occurs or the member is not newer than existing 100 * one while -u is specifed. 101 */ 102 static struct ar_obj * 103 create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime) 104 { 105 struct ar_obj *obj; 106 struct stat sb; 107 const char *bname; 108 109 if (name == NULL) 110 return (NULL); 111 112 obj = malloc(sizeof(struct ar_obj)); 113 if (obj == NULL) 114 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 115 if ((obj->fd = open(name, O_RDONLY, 0)) < 0) { 116 bsdar_warnc(bsdar, errno, "can't open file: %s", name); 117 free(obj); 118 return (NULL); 119 } 120 121 if ((bname = basename(name)) == NULL) 122 bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed"); 123 if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) { 124 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL) 125 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 126 (void)strncpy(obj->name, bname, _TRUNCATE_LEN); 127 obj->name[_TRUNCATE_LEN] = '\0'; 128 } else 129 if ((obj->name = strdup(bname)) == NULL) 130 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed"); 131 132 if (fstat(obj->fd, &sb) < 0) { 133 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name); 134 goto giveup; 135 } 136 if (!S_ISREG(sb.st_mode)) { 137 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name); 138 goto giveup; 139 } 140 141 /* 142 * When option '-u' is specified and member is not newer than the 143 * existing one, the replace will not happen. While if mtime == 0, 144 * which indicates that this is to "replace a none exist member", 145 * the replace will proceed regardless of '-u'. 146 */ 147 if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime) 148 goto giveup; 149 150 obj->uid = sb.st_uid; 151 obj->gid = sb.st_gid; 152 obj->md = sb.st_mode; 153 obj->size = sb.st_size; 154 obj->mtime = sb.st_mtime; 155 obj->dev = sb.st_dev; 156 obj->ino = sb.st_ino; 157 158 if (obj->size == 0) { 159 obj->maddr = NULL; 160 return (obj); 161 } 162 163 if ((obj->maddr = mmap(NULL, obj->size, PROT_READ, 164 MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) { 165 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name); 166 goto giveup; 167 } 168 if (close(obj->fd) < 0) 169 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s", 170 obj->name); 171 172 return (obj); 173 174 giveup: 175 if (close(obj->fd) < 0) 176 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s", 177 obj->name); 178 free(obj->name); 179 free(obj); 180 return (NULL); 181 } 182 183 /* 184 * Insert obj to the tail, or before/after the pos obj. 185 */ 186 static void 187 insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos) 188 { 189 if (obj == NULL) 190 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj"); 191 192 if (pos == NULL || obj == pos) 193 /* 194 * If the object to move happens to be the posistion obj, 195 * or if there is not a pos obj, move it to tail. 196 */ 197 goto tail; 198 199 if (bsdar->options & AR_B) { 200 TAILQ_INSERT_BEFORE(pos, obj, objs); 201 return; 202 } 203 if (bsdar->options & AR_A) { 204 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs); 205 return; 206 } 207 208 tail: 209 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs); 210 211 } 212 213 /* 214 * Determine the constitution of resulting archive. 215 */ 216 static void 217 write_archive(struct bsdar *bsdar, char mode) 218 { 219 struct archive *a; 220 struct archive_entry *entry; 221 struct ar_obj *nobj, *obj, *obj_temp, *pos; 222 struct stat sb; 223 const char *name; 224 const char *bname; 225 char *buff; 226 char **av; 227 size_t size; 228 int i, r; 229 230 TAILQ_INIT(&bsdar->v_obj); 231 nobj = NULL; 232 pos = NULL; 233 memset(&sb, 0, sizeof(sb)); 234 235 /* By default, no compression is assumed. */ 236 bsdar->compression = ARCHIVE_COMPRESSION_NONE; 237 238 /* 239 * Test if the specified archive exists, to figure out 240 * whether we are creating one here. 241 */ 242 if (stat(bsdar->filename, &sb) != 0) { 243 if (errno != ENOENT) { 244 bsdar_warnc(bsdar, 0, "stat %s failed", 245 bsdar->filename); 246 return; 247 } 248 249 /* We do not create archive in mode 'd', 'm' and 's'. */ 250 if (mode != 'r') { 251 bsdar_warnc(bsdar, 0, "%s: no such file", 252 bsdar->filename); 253 return; 254 } 255 256 /* Issue a warning if -c is not specified when creating. */ 257 if (!(bsdar->options & AR_C)) 258 bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename); 259 goto new_archive; 260 } 261 262 /* 263 * First read members from existing archive. 264 */ 265 if ((a = archive_read_new()) == NULL) 266 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed"); 267 archive_read_support_compression_all(a); 268 archive_read_support_format_ar(a); 269 AC(archive_read_open_filename(a, bsdar->filename, DEF_BLKSZ)); 270 for (;;) { 271 r = archive_read_next_header(a, &entry); 272 if (r == ARCHIVE_FATAL) 273 bsdar_errc(bsdar, EX_DATAERR, 0, "%s", 274 archive_error_string(a)); 275 if (r == ARCHIVE_EOF) 276 break; 277 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY) 278 bsdar_warnc(bsdar, 0, "%s", archive_error_string(a)); 279 if (r == ARCHIVE_RETRY) { 280 bsdar_warnc(bsdar, 0, "Retrying..."); 281 continue; 282 } 283 284 /* 285 * Remember the compression mode of existing archive. 286 * If neither -j nor -z is specified, this mode will 287 * be used for resulting archive. 288 */ 289 bsdar->compression = archive_compression(a); 290 291 name = archive_entry_pathname(entry); 292 293 /* 294 * skip pseudo members. 295 */ 296 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0) 297 continue; 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 * For mode 's', no member will be moved, deleted or replaced. 340 */ 341 if (mode == 's') 342 goto write_objs; 343 344 /* 345 * Try to find the position member specified by user. 346 */ 347 if (bsdar->options & AR_A || bsdar->options & AR_B) { 348 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 349 if (strcmp(obj->name, bsdar->posarg) == 0) { 350 pos = obj; 351 break; 352 } 353 } 354 355 /* 356 * If can't find `pos' specified by user, 357 * sliently insert objects at tail. 358 */ 359 if (pos == NULL) 360 bsdar->options &= ~(AR_A | AR_B); 361 } 362 363 for (i = 0; i < bsdar->argc; i++) { 364 av = &bsdar->argv[i]; 365 366 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 367 if ((bname = basename(*av)) == NULL) 368 bsdar_errc(bsdar, EX_SOFTWARE, errno, 369 "basename failed"); 370 if (bsdar->options & AR_TR) { 371 if (strncmp(bname, obj->name, _TRUNCATE_LEN)) 372 continue; 373 } else 374 if (strcmp(bname, obj->name) != 0) 375 continue; 376 377 if (mode == 'r') { 378 /* 379 * if the new member is not qualified 380 * to replace the old one, skip it. 381 */ 382 nobj = create_obj_from_file(bsdar, *av, 383 obj->mtime); 384 if (nobj == NULL) 385 goto skip_obj; 386 } 387 388 if (bsdar->options & AR_V) 389 (void)fprintf(stdout, "%c - %s\n", mode, 390 *av); 391 392 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 393 if (mode == 'd' || mode == 'r') { 394 free(obj->maddr); 395 free(obj->name); 396 free(obj); 397 } 398 399 if (mode == 'm') 400 insert_obj(bsdar, obj, pos); 401 if (mode == 'r') 402 insert_obj(bsdar, nobj, pos); 403 404 skip_obj: 405 *av = NULL; 406 break; 407 } 408 409 } 410 411 new_archive: 412 /* 413 * When operating in mode 'r', directly add those user specified 414 * objects which do not exist in current archive. 415 */ 416 for (i = 0; i < bsdar->argc; i++) { 417 av = &bsdar->argv[i]; 418 if (*av != NULL && mode == 'r') { 419 nobj = create_obj_from_file(bsdar, *av, 0); 420 if (nobj != NULL) 421 insert_obj(bsdar, nobj, pos); 422 if (bsdar->options & AR_V && nobj != NULL) 423 (void)fprintf(stdout, "a - %s\n", *av); 424 *av = NULL; 425 } 426 } 427 428 write_objs: 429 write_objs(bsdar); 430 write_cleanup(bsdar); 431 } 432 433 /* 434 * Memory cleaning up. 435 */ 436 static void 437 write_cleanup(struct bsdar *bsdar) 438 { 439 struct ar_obj *obj, *obj_temp; 440 441 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) { 442 if (obj->fd == -1) 443 free(obj->maddr); 444 else 445 if (obj->maddr != NULL && munmap(obj->maddr, obj->size)) 446 bsdar_warnc(bsdar, errno, 447 "can't munmap file: %s", obj->name); 448 TAILQ_REMOVE(&bsdar->v_obj, obj, objs); 449 free(obj->name); 450 free(obj); 451 } 452 453 free(bsdar->as); 454 free(bsdar->s_so); 455 free(bsdar->s_sn); 456 bsdar->as = NULL; 457 bsdar->s_so = NULL; 458 bsdar->s_sn = NULL; 459 } 460 461 /* 462 * Wrapper for archive_write_data(). 463 */ 464 static void 465 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s) 466 { 467 if (archive_write_data(a, buf, s) != (ssize_t)s) 468 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s", 469 archive_error_string(a)); 470 } 471 472 /* 473 * Write the resulting archive members. 474 */ 475 static void 476 write_objs(struct bsdar *bsdar) 477 { 478 struct ar_obj *obj; 479 struct archive *a; 480 struct archive_entry *entry; 481 size_t s_sz; /* size of archive symbol table. */ 482 size_t pm_sz; /* size of pseudo members */ 483 int i, nr; 484 485 if (elf_version(EV_CURRENT) == EV_NONE) 486 bsdar_errc(bsdar, EX_SOFTWARE, 0, 487 "ELF library initialization failed: %s", elf_errmsg(-1)); 488 489 bsdar->rela_off = 0; 490 491 /* Create archive symbol table and archive string table, if need. */ 492 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 493 if (!(bsdar->options & AR_SS) && obj->maddr != NULL) 494 create_symtab_entry(bsdar, obj->maddr, obj->size); 495 if (strlen(obj->name) > _MAXNAMELEN_SVR4) 496 add_to_ar_str_table(bsdar, obj->name); 497 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2; 498 } 499 500 /* 501 * Pad the symbol name string table. It is treated specially because 502 * symbol name table should be padded by a '\0', not the common '\n' 503 * for other members. The size of sn table includes the pad bit. 504 */ 505 if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0) 506 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 507 508 /* 509 * Archive string table is padded by a "\n" as the normal members. 510 * The difference is that the size of archive string table counts 511 * in the pad bit, while normal members' size fileds do not. 512 */ 513 if (bsdar->as != NULL && bsdar->as_sz % 2 != 0) 514 bsdar->as[bsdar->as_sz++] = '\n'; 515 516 /* 517 * If there is a symbol table, calculate the size of pseudo members, 518 * convert previously stored relative offsets to absolute ones, and 519 * then make them Big Endian. 520 * 521 * absolute_offset = htobe32(relative_offset + size_of_pseudo_members) 522 */ 523 524 if (bsdar->s_cnt != 0) { 525 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz; 526 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz); 527 if (bsdar->as != NULL) 528 pm_sz += _ARHDR_LEN + bsdar->as_sz; 529 for (i = 0; (size_t)i < bsdar->s_cnt; i++) 530 *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) + 531 pm_sz); 532 } 533 534 if ((a = archive_write_new()) == NULL) 535 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed"); 536 537 archive_write_set_format_ar_svr4(a); 538 539 /* The compression mode of the existing archive is used 540 * for the result archive or if creating a new archive, we 541 * do not compress archive by default. This default behavior can 542 * be overrided by compression mode specified explicitly 543 * through command line option `-j' or `-z'. 544 */ 545 if (bsdar->options & AR_J) 546 bsdar->compression = ARCHIVE_COMPRESSION_BZIP2; 547 if (bsdar->options & AR_Z) 548 bsdar->compression = ARCHIVE_COMPRESSION_GZIP; 549 if (bsdar->compression == ARCHIVE_COMPRESSION_BZIP2) 550 archive_write_set_compression_bzip2(a); 551 else if (bsdar->compression == ARCHIVE_COMPRESSION_GZIP) 552 archive_write_set_compression_gzip(a); 553 else 554 archive_write_set_compression_none(a); 555 556 AC(archive_write_open_filename(a, bsdar->filename)); 557 558 /* 559 * write the archive symbol table, if there is one. 560 * If options -s is explicitly specified or we are invoked 561 * as ranlib, write the symbol table even if it is empty. 562 */ 563 if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) || 564 bsdar->options & AR_S) { 565 entry = archive_entry_new(); 566 archive_entry_copy_pathname(entry, "/"); 567 archive_entry_set_mtime(entry, time(NULL), 0); 568 archive_entry_set_size(entry, (bsdar->s_cnt + 1) * 569 sizeof(uint32_t) + bsdar->s_sn_sz); 570 AC(archive_write_header(a, entry)); 571 nr = htobe32(bsdar->s_cnt); 572 write_data(bsdar, a, &nr, sizeof(uint32_t)); 573 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) * 574 bsdar->s_cnt); 575 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz); 576 archive_entry_free(entry); 577 } 578 579 /* write the archive string table, if any. */ 580 if (bsdar->as != NULL) { 581 entry = archive_entry_new(); 582 archive_entry_copy_pathname(entry, "//"); 583 archive_entry_set_size(entry, bsdar->as_sz); 584 AC(archive_write_header(a, entry)); 585 write_data(bsdar, a, bsdar->as, bsdar->as_sz); 586 archive_entry_free(entry); 587 } 588 589 /* write normal members. */ 590 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) { 591 entry = archive_entry_new(); 592 archive_entry_copy_pathname(entry, obj->name); 593 archive_entry_set_uid(entry, obj->uid); 594 archive_entry_set_gid(entry, obj->gid); 595 archive_entry_set_mode(entry, obj->md); 596 archive_entry_set_size(entry, obj->size); 597 archive_entry_set_mtime(entry, obj->mtime, 0); 598 archive_entry_set_dev(entry, obj->dev); 599 archive_entry_set_ino(entry, obj->ino); 600 archive_entry_set_filetype(entry, AE_IFREG); 601 AC(archive_write_header(a, entry)); 602 write_data(bsdar, a, obj->maddr, obj->size); 603 archive_entry_free(entry); 604 } 605 606 AC(archive_write_close(a)); 607 AC(archive_write_finish(a)); 608 } 609 610 /* 611 * Extract global symbols from ELF binary members. 612 */ 613 static void 614 create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size) 615 { 616 Elf *e; 617 Elf_Scn *scn; 618 GElf_Shdr shdr; 619 GElf_Sym sym; 620 Elf_Data *data; 621 char *name; 622 size_t n, shstrndx; 623 int elferr, tabndx, len, i; 624 625 if ((e = elf_memory(maddr, size)) == NULL) { 626 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s", 627 elf_errmsg(-1)); 628 return; 629 } 630 if (elf_kind(e) != ELF_K_ELF) { 631 /* Sliently ignore non-elf member. */ 632 elf_end(e); 633 return; 634 } 635 if (elf_getshstrndx(e, &shstrndx) == 0) { 636 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s", 637 elf_errmsg(-1)); 638 elf_end(e); 639 return; 640 } 641 642 tabndx = -1; 643 scn = NULL; 644 while ((scn = elf_nextscn(e, scn)) != NULL) { 645 if (gelf_getshdr(scn, &shdr) != &shdr) { 646 bsdar_warnc(bsdar, 0, 647 "elf_getshdr failed: %s", elf_errmsg(-1)); 648 continue; 649 } 650 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) { 651 bsdar_warnc(bsdar, 0, 652 "elf_strptr failed: %s", elf_errmsg(-1)); 653 continue; 654 } 655 if (strcmp(name, ".strtab") == 0) { 656 tabndx = elf_ndxscn(scn); 657 break; 658 } 659 } 660 elferr = elf_errno(); 661 if (elferr != 0) 662 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s", 663 elf_errmsg(elferr)); 664 if (tabndx == -1) { 665 bsdar_warnc(bsdar, 0, "can't find .strtab section"); 666 elf_end(e); 667 return; 668 } 669 670 scn = NULL; 671 while ((scn = elf_nextscn(e, scn)) != NULL) { 672 if (gelf_getshdr(scn, &shdr) != &shdr) { 673 bsdar_warnc(bsdar, EX_SOFTWARE, 0, 674 "elf_getshdr failed: %s", elf_errmsg(-1)); 675 continue; 676 } 677 if (shdr.sh_type != SHT_SYMTAB) 678 continue; 679 680 data = NULL; 681 n = 0; 682 while (n < shdr.sh_size && 683 (data = elf_getdata(scn, data)) != NULL) { 684 len = data->d_size / shdr.sh_entsize; 685 for (i = 0; i < len; i++) { 686 if (gelf_getsym(data, i, &sym) != &sym) { 687 bsdar_warnc(bsdar, EX_SOFTWARE, 0, 688 "gelf_getsym failed: %s", 689 elf_errmsg(-1)); 690 continue; 691 } 692 693 /* keep only global or weak symbols */ 694 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL && 695 GELF_ST_BIND(sym.st_info) != STB_WEAK) 696 continue; 697 698 /* keep only defined symbols */ 699 if (sym.st_shndx == SHN_UNDEF) 700 continue; 701 702 if ((name = elf_strptr(e, tabndx, 703 sym.st_name)) == NULL) { 704 bsdar_warnc(bsdar, EX_SOFTWARE, 0, 705 "elf_strptr failed: %s", 706 elf_errmsg(-1)); 707 continue; 708 } 709 710 add_to_ar_sym_table(bsdar, name); 711 } 712 } 713 } 714 elferr = elf_errno(); 715 if (elferr != 0) 716 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s", 717 elf_errmsg(elferr)); 718 719 elf_end(e); 720 } 721 722 /* 723 * Append to the archive string table buffer. 724 */ 725 static void 726 add_to_ar_str_table(struct bsdar *bsdar, const char *name) 727 { 728 729 if (bsdar->as == NULL) { 730 bsdar->as_cap = _INIT_AS_CAP; 731 bsdar->as_sz = 0; 732 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL) 733 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 734 } 735 736 /* 737 * The space required for holding one member name in as table includes: 738 * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding). 739 */ 740 while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) { 741 bsdar->as_cap *= 2; 742 bsdar->as = realloc(bsdar->as, bsdar->as_cap); 743 if (bsdar->as == NULL) 744 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 745 } 746 strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name)); 747 bsdar->as_sz += strlen(name); 748 bsdar->as[bsdar->as_sz++] = '/'; 749 bsdar->as[bsdar->as_sz++] = '\n'; 750 } 751 752 /* 753 * Append to the archive symbol table buffer. 754 */ 755 static void 756 add_to_ar_sym_table(struct bsdar *bsdar, const char *name) 757 { 758 759 if (bsdar->s_so == NULL) { 760 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) == 761 NULL) 762 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 763 bsdar->s_so_cap = _INIT_SYMOFF_CAP; 764 bsdar->s_cnt = 0; 765 } 766 767 if (bsdar->s_sn == NULL) { 768 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL) 769 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed"); 770 bsdar->s_sn_cap = _INIT_SYMNAME_CAP; 771 bsdar->s_sn_sz = 0; 772 } 773 774 if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) { 775 bsdar->s_so_cap *= 2; 776 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap); 777 if (bsdar->s_so == NULL) 778 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 779 } 780 bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off; 781 bsdar->s_cnt++; 782 783 /* 784 * The space required for holding one symbol name in sn table includes: 785 * strlen(name) + (1 for '\n') + (possibly 1 for padding). 786 */ 787 while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) { 788 bsdar->s_sn_cap *= 2; 789 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap); 790 if (bsdar->s_sn == NULL) 791 bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed"); 792 } 793 strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name)); 794 bsdar->s_sn_sz += strlen(name); 795 bsdar->s_sn[bsdar->s_sn_sz++] = '\0'; 796 } 797