usr.bin/ar/write.c

   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     free_obj(struct bsdar *bsdar, struct ar_obj *obj);
  62 static void     insert_obj(struct bsdar *bsdar, struct ar_obj *obj,
  63                     struct ar_obj *pos);
  64 static void     read_objs(struct bsdar *bsdar, const char *archive,
  65                     int checkargv);
  66 static void     write_archive(struct bsdar *bsdar, char mode);
  67 static void     write_cleanup(struct bsdar *bsdar);
  68 static void     write_data(struct bsdar *bsdar, struct archive *a,
  69                     const void *buf, size_t s);
  70 static void     write_objs(struct bsdar *bsdar);
  71
  72 void
  73 ar_mode_d(struct bsdar *bsdar)
  74 {
  75
  76         write_archive(bsdar, 'd');
  77 }
  78
  79 void
  80 ar_mode_m(struct bsdar *bsdar)
  81 {
  82
  83         write_archive(bsdar, 'm');
  84 }
  85
  86 void
  87 ar_mode_q(struct bsdar *bsdar)
  88 {
  89
  90         write_archive(bsdar, 'q');
  91 }
  92
  93 void
  94 ar_mode_r(struct bsdar *bsdar)
  95 {
  96
  97         write_archive(bsdar, 'r');
  98 }
  99
 100 void
 101 ar_mode_s(struct bsdar *bsdar)
 102 {
 103
 104         write_archive(bsdar, 's');
 105 }
 106
 107 void
 108 ar_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  */
 119 static struct ar_obj *
 120 create_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
 204 giveup:
 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  */
 216 static void
 217 free_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  */
 232 static void
 233 insert_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
 254 tail:
 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  */
 265 static void
 266 read_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_compression_none(a);
 281         archive_read_support_format_ar(a);
 282         AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
 283         for (;;) {
 284                 r = archive_read_next_header(a, &entry);
 285                 if (r == ARCHIVE_FATAL)
 286                         bsdar_errc(bsdar, EX_DATAERR, 0, "%s",
 287                             archive_error_string(a));
 288                 if (r == ARCHIVE_EOF)
 289                         break;
 290                 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
 291                         bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
 292                 if (r == ARCHIVE_RETRY) {
 293                         bsdar_warnc(bsdar, 0, "Retrying...");
 294                         continue;
 295                 }
 296
 297                 name = archive_entry_pathname(entry);
 298
 299                 /*
 300                  * skip pseudo members.
 301                  */
 302                 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
 303                         continue;
 304
 305                 /*
 306                  * If checkargv is set, only read those members specified
 307                  * in argv.
 308                  */
 309                 if (checkargv && bsdar->argc > 0) {
 310                         find = 0;
 311                         for(i = 0; i < bsdar->argc; i++) {
 312                                 av = &bsdar->argv[i];
 313                                 if (*av == NULL)
 314                                         continue;
 315                                 if ((bname = basename(*av)) == NULL)
 316                                         bsdar_errc(bsdar, EX_SOFTWARE, errno,
 317                                             "basename failed");
 318                                 if (strcmp(bname, name) != 0)
 319                                         continue;
 320
 321                                 *av = NULL;
 322                                 find = 1;
 323                                 break;
 324                         }
 325                         if (!find)
 326                                 continue;
 327                 }
 328
 329                 size = archive_entry_size(entry);
 330
 331                 if (size > 0) {
 332                         if ((buff = malloc(size)) == NULL)
 333                                 bsdar_errc(bsdar, EX_SOFTWARE, errno,
 334                                     "malloc failed");
 335                         if (archive_read_data(a, buff, size) != (ssize_t)size) {
 336                                 bsdar_warnc(bsdar, 0, "%s",
 337                                     archive_error_string(a));
 338                                 free(buff);
 339                                 continue;
 340                         }
 341                 } else
 342                         buff = NULL;
 343
 344                 obj = malloc(sizeof(struct ar_obj));
 345                 if (obj == NULL)
 346                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 347                 obj->maddr = buff;
 348                 if ((obj->name = strdup(name)) == NULL)
 349                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
 350                 obj->size = size;
 351                 obj->uid = archive_entry_uid(entry);
 352                 obj->gid = archive_entry_gid(entry);
 353                 obj->md = archive_entry_mode(entry);
 354                 obj->mtime = archive_entry_mtime(entry);
 355                 obj->dev = 0;
 356                 obj->ino = 0;
 357
 358                 /*
 359                  * Objects from archive have obj->fd set to -1,
 360                  * for the ease of cleaning up.
 361                  */
 362                 obj->fd = -1;
 363                 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 364         }
 365         AC(archive_read_close(a));
 366         AC(archive_read_finish(a));
 367 }
 368
 369 /*
 370  * Determine the constitution of resulting archive.
 371  */
 372 static void
 373 write_archive(struct bsdar *bsdar, char mode)
 374 {
 375         struct ar_obj            *nobj, *obj, *obj_temp, *pos;
 376         struct stat               sb;
 377         const char               *bname;
 378         char                    **av;
 379         int                       i;
 380
 381         TAILQ_INIT(&bsdar->v_obj);
 382         nobj = NULL;
 383         pos = NULL;
 384         memset(&sb, 0, sizeof(sb));
 385
 386         /*
 387          * Test if the specified archive exists, to figure out
 388          * whether we are creating one here.
 389          */
 390         if (stat(bsdar->filename, &sb) != 0) {
 391                 if (errno != ENOENT) {
 392                         bsdar_warnc(bsdar, 0, "stat %s failed",
 393                             bsdar->filename);
 394                         return;
 395                 }
 396
 397                 /* We do not create archive in mode 'd', 'm' and 's'.  */
 398                 if (mode != 'r' && mode != 'q') {
 399                         bsdar_warnc(bsdar, 0, "%s: no such file",
 400                             bsdar->filename);
 401                         return;
 402                 }
 403
 404                 /* Issue a warning if -c is not specified when creating. */
 405                 if (!(bsdar->options & AR_C))
 406                         bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
 407                 goto new_archive;
 408         }
 409
 410         /*
 411          * First read members from existing archive.
 412          */
 413         read_objs(bsdar, bsdar->filename, 0);
 414
 415         /*
 416          * For mode 's', no member will be moved, deleted or replaced.
 417          */
 418         if (mode == 's')
 419                 goto write_objs;
 420
 421         /*
 422          * For mode 'q', we don't need to adjust existing members either.
 423          * Also, -a, -b and -i are ignored in this mode. New members are
 424          * always inserted at tail.
 425          */
 426         if (mode == 'q')
 427                 goto new_archive;
 428
 429         /*
 430          * Mode 'A' adds the contents of another archive to the tail of
 431          * current archive. Note that mode 'A' is a special mode for the
 432          * ADDLIB command of the ar script mode. Currently there is no
 433          * access to this function from the ar command line mode.
 434          */
 435         if (mode == 'A') {
 436                 /*
 437                  * Read objects from the target archive of ADDLIB command.
 438                  * If there are members specified in argv, read those members
 439                  * only, otherwise the entire archive will be read.
 440                  */
 441                 read_objs(bsdar, bsdar->addlib, 1);
 442                 goto write_objs;
 443         }
 444
 445         /*
 446          * Try to find the position member specified by user.
 447          */
 448         if (bsdar->options & AR_A || bsdar->options & AR_B) {
 449                 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 450                         if (strcmp(obj->name, bsdar->posarg) == 0) {
 451                                 pos = obj;
 452                                 break;
 453                         }
 454                 }
 455
 456                 /*
 457                  * If can't find `pos' specified by user,
 458                  * silently insert objects at tail.
 459                  */
 460                 if (pos == NULL)
 461                         bsdar->options &= ~(AR_A | AR_B);
 462         }
 463
 464         for (i = 0; i < bsdar->argc; i++) {
 465                 av = &bsdar->argv[i];
 466
 467                 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 468                         if ((bname = basename(*av)) == NULL)
 469                                 bsdar_errc(bsdar, EX_SOFTWARE, errno,
 470                                     "basename failed");
 471                         if (bsdar->options & AR_TR) {
 472                                 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
 473                                         continue;
 474                         } else
 475                                 if (strcmp(bname, obj->name) != 0)
 476                                         continue;
 477
 478                         if (mode == 'r') {
 479                                 /*
 480                                  * if the new member is not qualified
 481                                  * to replace the old one, skip it.
 482                                  */
 483                                 nobj = create_obj_from_file(bsdar, *av,
 484                                     obj->mtime);
 485                                 if (nobj == NULL)
 486                                         goto skip_obj;
 487                         }
 488
 489                         if (bsdar->options & AR_V)
 490                                 (void)fprintf(stdout, "%c - %s\n", mode,
 491                                     *av);
 492
 493                         TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 494                         if (mode == 'd' || mode == 'r')
 495                                 free_obj(bsdar, obj);
 496
 497                         if (mode == 'm')
 498                                 insert_obj(bsdar, obj, pos);
 499                         if (mode == 'r')
 500                                 insert_obj(bsdar, nobj, pos);
 501
 502                 skip_obj:
 503                         *av = NULL;
 504                         break;
 505                 }
 506
 507         }
 508
 509 new_archive:
 510         /*
 511          * When operating in mode 'r', directly add those user specified
 512          * objects which do not exist in current archive. When operating
 513          * in mode 'q', all objects specified in command line args are
 514          * appended to the archive, without comparing with existing ones.
 515          */
 516         for (i = 0; i < bsdar->argc; i++) {
 517                 av = &bsdar->argv[i];
 518                 if (*av != NULL && (mode == 'r' || mode == 'q')) {
 519                         nobj = create_obj_from_file(bsdar, *av, 0);
 520                         if (nobj != NULL)
 521                                 insert_obj(bsdar, nobj, pos);
 522                         if (bsdar->options & AR_V && nobj != NULL)
 523                                 (void)fprintf(stdout, "a - %s\n", *av);
 524                         *av = NULL;
 525                 }
 526         }
 527
 528 write_objs:
 529         write_objs(bsdar);
 530         write_cleanup(bsdar);
 531 }
 532
 533 /*
 534  * Memory cleaning up.
 535  */
 536 static void
 537 write_cleanup(struct bsdar *bsdar)
 538 {
 539         struct ar_obj           *obj, *obj_temp;
 540
 541         TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 542                 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 543                 free_obj(bsdar, obj);
 544         }
 545
 546         free(bsdar->as);
 547         free(bsdar->s_so);
 548         free(bsdar->s_sn);
 549         bsdar->as = NULL;
 550         bsdar->s_so = NULL;
 551         bsdar->s_sn = NULL;
 552 }
 553
 554 /*
 555  * Wrapper for archive_write_data().
 556  */
 557 static void
 558 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
 559 {
 560         if (archive_write_data(a, buf, s) != (ssize_t)s)
 561                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
 562                     archive_error_string(a));
 563 }
 564
 565 /*
 566  * Write the resulting archive members.
 567  */
 568 static void
 569 write_objs(struct bsdar *bsdar)
 570 {
 571         struct ar_obj           *obj;
 572         struct archive          *a;
 573         struct archive_entry    *entry;
 574         size_t s_sz;            /* size of archive symbol table. */
 575         size_t pm_sz;           /* size of pseudo members */
 576         int                      i, nr;
 577
 578         if (elf_version(EV_CURRENT) == EV_NONE)
 579                 bsdar_errc(bsdar, EX_SOFTWARE, 0,
 580                     "ELF library initialization failed: %s", elf_errmsg(-1));
 581
 582         bsdar->rela_off = 0;
 583
 584         /* Create archive symbol table and archive string table, if need. */
 585         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 586                 if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
 587                         create_symtab_entry(bsdar, obj->maddr, obj->size);
 588                 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
 589                         add_to_ar_str_table(bsdar, obj->name);
 590                 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
 591         }
 592
 593         /*
 594          * Pad the symbol name string table. It is treated specially because
 595          * symbol name table should be padded by a '\0', not the common '\n'
 596          * for other members. The size of sn table includes the pad bit.
 597          */
 598         if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
 599                 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 600
 601         /*
 602          * Archive string table is padded by a "\n" as the normal members.
 603          * The difference is that the size of archive string table counts
 604          * in the pad bit, while normal members' size fileds do not.
 605          */
 606         if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
 607                 bsdar->as[bsdar->as_sz++] = '\n';
 608
 609         /*
 610          * If there is a symbol table, calculate the size of pseudo members,
 611          * convert previously stored relative offsets to absolute ones, and
 612          * then make them Big Endian.
 613          *
 614          * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
 615          */
 616
 617         if (bsdar->s_cnt != 0) {
 618                 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
 619                 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
 620                 if (bsdar->as != NULL)
 621                         pm_sz += _ARHDR_LEN + bsdar->as_sz;
 622                 for (i = 0; (size_t)i < bsdar->s_cnt; i++)
 623                         *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
 624                             pm_sz);
 625         }
 626
 627         if ((a = archive_write_new()) == NULL)
 628                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
 629
 630         archive_write_set_format_ar_svr4(a);
 631         archive_write_set_compression_none(a);
 632
 633         AC(archive_write_open_filename(a, bsdar->filename));
 634
 635         /*
 636          * write the archive symbol table, if there is one.
 637          * If options -s is explicitly specified or we are invoked
 638          * as ranlib, write the symbol table even if it is empty.
 639          */
 640         if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
 641             bsdar->options & AR_S) {
 642                 entry = archive_entry_new();
 643                 archive_entry_copy_pathname(entry, "/");
 644                 if ((bsdar->options & AR_D) == 0)
 645                         archive_entry_set_mtime(entry, time(NULL), 0);
 646                 archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
 647                     sizeof(uint32_t) + bsdar->s_sn_sz);
 648                 AC(archive_write_header(a, entry));
 649                 nr = htobe32(bsdar->s_cnt);
 650                 write_data(bsdar, a, &nr, sizeof(uint32_t));
 651                 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
 652                     bsdar->s_cnt);
 653                 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
 654                 archive_entry_free(entry);
 655         }
 656
 657         /* write the archive string table, if any. */
 658         if (bsdar->as != NULL) {
 659                 entry = archive_entry_new();
 660                 archive_entry_copy_pathname(entry, "//");
 661                 archive_entry_set_size(entry, bsdar->as_sz);
 662                 AC(archive_write_header(a, entry));
 663                 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
 664                 archive_entry_free(entry);
 665         }
 666
 667         /* write normal members. */
 668         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 669                 entry = archive_entry_new();
 670                 archive_entry_copy_pathname(entry, obj->name);
 671                 archive_entry_set_uid(entry, obj->uid);
 672                 archive_entry_set_gid(entry, obj->gid);
 673                 archive_entry_set_mode(entry, obj->md);
 674                 archive_entry_set_size(entry, obj->size);
 675                 archive_entry_set_mtime(entry, obj->mtime, 0);
 676                 archive_entry_set_dev(entry, obj->dev);
 677                 archive_entry_set_ino(entry, obj->ino);
 678                 archive_entry_set_filetype(entry, AE_IFREG);
 679                 AC(archive_write_header(a, entry));
 680                 write_data(bsdar, a, obj->maddr, obj->size);
 681                 archive_entry_free(entry);
 682         }
 683
 684         AC(archive_write_close(a));
 685         AC(archive_write_finish(a));
 686 }
 687
 688 /*
 689  * Extract global symbols from ELF binary members.
 690  */
 691 static void
 692 create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
 693 {
 694         Elf             *e;
 695         Elf_Scn         *scn;
 696         GElf_Shdr        shdr;
 697         GElf_Sym         sym;
 698         Elf_Data        *data;
 699         char            *name;
 700         size_t           n, shstrndx;
 701         int              elferr, tabndx, len, i;
 702
 703         if ((e = elf_memory(maddr, size)) == NULL) {
 704                 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
 705                      elf_errmsg(-1));
 706                 return;
 707         }
 708         if (elf_kind(e) != ELF_K_ELF) {
 709                 /* Silently ignore non-elf member. */
 710                 elf_end(e);
 711                 return;
 712         }
 713         if (elf_getshstrndx(e, &shstrndx) == 0) {
 714                 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s",
 715                      elf_errmsg(-1));
 716                 elf_end(e);
 717                 return;
 718         }
 719
 720         tabndx = -1;
 721         scn = NULL;
 722         while ((scn = elf_nextscn(e, scn)) != NULL) {
 723                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 724                         bsdar_warnc(bsdar, 0,
 725                             "elf_getshdr failed: %s", elf_errmsg(-1));
 726                         continue;
 727                 }
 728                 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
 729                         bsdar_warnc(bsdar, 0,
 730                             "elf_strptr failed: %s", elf_errmsg(-1));
 731                         continue;
 732                 }
 733                 if (strcmp(name, ".strtab") == 0) {
 734                         tabndx = elf_ndxscn(scn);
 735                         break;
 736                 }
 737         }
 738         elferr = elf_errno();
 739         if (elferr != 0)
 740                 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
 741                      elf_errmsg(elferr));
 742         if (tabndx == -1) {
 743                 bsdar_warnc(bsdar, 0, "can't find .strtab section");
 744                 elf_end(e);
 745                 return;
 746         }
 747
 748         scn = NULL;
 749         while ((scn = elf_nextscn(e, scn)) != NULL) {
 750                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 751                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 752                             "elf_getshdr failed: %s", elf_errmsg(-1));
 753                         continue;
 754                 }
 755                 if (shdr.sh_type != SHT_SYMTAB)
 756                         continue;
 757
 758                 data = NULL;
 759                 n = 0;
 760                 while (n < shdr.sh_size &&
 761                     (data = elf_getdata(scn, data)) != NULL) {
 762                         len = data->d_size / shdr.sh_entsize;
 763                         for (i = 0; i < len; i++) {
 764                                 if (gelf_getsym(data, i, &sym) != &sym) {
 765                                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 766                                             "gelf_getsym failed: %s",
 767                                              elf_errmsg(-1));
 768                                         continue;
 769                                 }
 770
 771                                 /* keep only global or weak symbols */
 772                                 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
 773                                     GELF_ST_BIND(sym.st_info) != STB_WEAK)
 774                                         continue;
 775
 776                                 /* keep only defined symbols */
 777                                 if (sym.st_shndx == SHN_UNDEF)
 778                                         continue;
 779
 780                                 if ((name = elf_strptr(e, tabndx,
 781                                     sym.st_name)) == NULL) {
 782                                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 783                                             "elf_strptr failed: %s",
 784                                              elf_errmsg(-1));
 785                                         continue;
 786                                 }
 787
 788                                 add_to_ar_sym_table(bsdar, name);
 789                         }
 790                 }
 791         }
 792         elferr = elf_errno();
 793         if (elferr != 0)
 794                 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s",
 795                      elf_errmsg(elferr));
 796
 797         elf_end(e);
 798 }
 799
 800 /*
 801  * Append to the archive string table buffer.
 802  */
 803 static void
 804 add_to_ar_str_table(struct bsdar *bsdar, const char *name)
 805 {
 806
 807         if (bsdar->as == NULL) {
 808                 bsdar->as_cap = _INIT_AS_CAP;
 809                 bsdar->as_sz = 0;
 810                 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
 811                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 812         }
 813
 814         /*
 815          * The space required for holding one member name in as table includes:
 816          * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
 817          */
 818         while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
 819                 bsdar->as_cap *= 2;
 820                 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
 821                 if (bsdar->as == NULL)
 822                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 823         }
 824         strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
 825         bsdar->as_sz += strlen(name);
 826         bsdar->as[bsdar->as_sz++] = '/';
 827         bsdar->as[bsdar->as_sz++] = '\n';
 828 }
 829
 830 /*
 831  * Append to the archive symbol table buffer.
 832  */
 833 static void
 834 add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
 835 {
 836
 837         if (bsdar->s_so == NULL) {
 838                 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
 839                     NULL)
 840                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 841                 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
 842                 bsdar->s_cnt = 0;
 843         }
 844
 845         if (bsdar->s_sn == NULL) {
 846                 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
 847                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 848                 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
 849                 bsdar->s_sn_sz = 0;
 850         }
 851
 852         if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
 853                 bsdar->s_so_cap *= 2;
 854                 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
 855                 if (bsdar->s_so == NULL)
 856                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 857         }
 858         bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
 859         bsdar->s_cnt++;
 860
 861         /*
 862          * The space required for holding one symbol name in sn table includes:
 863          * strlen(name) + (1 for '\n') + (possibly 1 for padding).
 864          */
 865         while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
 866                 bsdar->s_sn_cap *= 2;
 867                 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
 868                 if (bsdar->s_sn == NULL)
 869                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 870         }
 871         strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
 872         bsdar->s_sn_sz += strlen(name);
 873         bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 874 }