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     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_all(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                 /*
 268                  * Remember the compression mode of existing archive.
 269                  * If neither -j nor -z is specified, this mode will
 270                  * be used for resulting archive.
 271                  */
 272                 bsdar->compression = archive_compression(a);
 273
 274                 name = archive_entry_pathname(entry);
 275
 276                 /*
 277                  * skip pseudo members.
 278                  */
 279                 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
 280                         continue;
 281
 282                 /*
 283                  * If checkargv is set, only read those members specified
 284                  * in argv.
 285                  */
 286                 if (checkargv && bsdar->argc > 0) {
 287                         find = 0;
 288                         for(i = 0; i < bsdar->argc; i++) {
 289                                 av = &bsdar->argv[i];
 290                                 if (*av == NULL)
 291                                         continue;
 292                                 if ((bname = basename(*av)) == NULL)
 293                                         bsdar_errc(bsdar, EX_SOFTWARE, errno,
 294                                             "basename failed");
 295                                 if (strcmp(bname, name) != 0)
 296                                         continue;
 297
 298                                 *av = NULL;
 299                                 find = 1;
 300                                 break;
 301                         }
 302                         if (!find)
 303                                 continue;
 304                 }
 305
 306                 size = archive_entry_size(entry);
 307
 308                 if (size > 0) {
 309                         if ((buff = malloc(size)) == NULL)
 310                                 bsdar_errc(bsdar, EX_SOFTWARE, errno,
 311                                     "malloc failed");
 312                         if (archive_read_data(a, buff, size) != (ssize_t)size) {
 313                                 bsdar_warnc(bsdar, 0, "%s",
 314                                     archive_error_string(a));
 315                                 free(buff);
 316                                 continue;
 317                         }
 318                 } else
 319                         buff = NULL;
 320
 321                 obj = malloc(sizeof(struct ar_obj));
 322                 if (obj == NULL)
 323                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 324                 obj->maddr = buff;
 325                 if ((obj->name = strdup(name)) == NULL)
 326                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
 327                 obj->size = size;
 328                 obj->uid = archive_entry_uid(entry);
 329                 obj->gid = archive_entry_gid(entry);
 330                 obj->md = archive_entry_mode(entry);
 331                 obj->mtime = archive_entry_mtime(entry);
 332                 obj->dev = 0;
 333                 obj->ino = 0;
 334
 335                 /*
 336                  * Objects from archive have obj->fd set to -1,
 337                  * for the ease of cleaning up.
 338                  */
 339                 obj->fd = -1;
 340                 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 341         }
 342         AC(archive_read_close(a));
 343         AC(archive_read_finish(a));
 344 }
 345
 346 /*
 347  * Determine the constitution of resulting archive.
 348  */
 349 static void
 350 write_archive(struct bsdar *bsdar, char mode)
 351 {
 352         struct ar_obj            *nobj, *obj, *obj_temp, *pos;
 353         struct stat               sb;
 354         const char               *bname;
 355         char                    **av;
 356         int                       i;
 357
 358         TAILQ_INIT(&bsdar->v_obj);
 359         nobj = NULL;
 360         pos = NULL;
 361         memset(&sb, 0, sizeof(sb));
 362
 363         /* By default, no compression is assumed. */
 364         bsdar->compression = ARCHIVE_COMPRESSION_NONE;
 365
 366         /*
 367          * Test if the specified archive exists, to figure out
 368          * whether we are creating one here.
 369          */
 370         if (stat(bsdar->filename, &sb) != 0) {
 371                 if (errno != ENOENT) {
 372                         bsdar_warnc(bsdar, 0, "stat %s failed",
 373                             bsdar->filename);
 374                         return;
 375                 }
 376
 377                 /* We do not create archive in mode 'd', 'm' and 's'.  */
 378                 if (mode != 'r' && mode != 'q') {
 379                         bsdar_warnc(bsdar, 0, "%s: no such file",
 380                             bsdar->filename);
 381                         return;
 382                 }
 383
 384                 /* Issue a warning if -c is not specified when creating. */
 385                 if (!(bsdar->options & AR_C))
 386                         bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
 387                 goto new_archive;
 388         }
 389
 390         /*
 391          * First read members from existing archive.
 392          */
 393         read_objs(bsdar, bsdar->filename, 0);
 394
 395         /*
 396          * For mode 's', no member will be moved, deleted or replaced.
 397          */
 398         if (mode == 's')
 399                 goto write_objs;
 400
 401         /*
 402          * For mode 'q', we don't need to adjust existing members either.
 403          * Also, -a, -b and -i are ignored in this mode. New members are
 404          * always inserted at tail.
 405          */
 406         if (mode == 'q')
 407                 goto new_archive;
 408
 409         /*
 410          * Mode 'A' adds the contents of another archive to the tail of
 411          * current archive. Note that mode 'A' is a special mode for the
 412          * ADDLIB command of the ar script mode. Currently there is no
 413          * access to this function from the ar command line mode.
 414          */
 415         if (mode == 'A') {
 416                 /*
 417                  * Read objects from the target archive of ADDLIB command.
 418                  * If there are members spcified in argv, read those members
 419                  * only, otherwise the entire archive will be read.
 420                  */
 421                 read_objs(bsdar, bsdar->addlib, 1);
 422                 goto write_objs;
 423         }
 424
 425         /*
 426          * Try to find the position member specified by user.
 427          */
 428         if (bsdar->options & AR_A || bsdar->options & AR_B) {
 429                 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 430                         if (strcmp(obj->name, bsdar->posarg) == 0) {
 431                                 pos = obj;
 432                                 break;
 433                         }
 434                 }
 435
 436                 /*
 437                  * If can't find `pos' specified by user,
 438                  * sliently insert objects at tail.
 439                  */
 440                 if (pos == NULL)
 441                         bsdar->options &= ~(AR_A | AR_B);
 442         }
 443
 444         for (i = 0; i < bsdar->argc; i++) {
 445                 av = &bsdar->argv[i];
 446
 447                 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 448                         if ((bname = basename(*av)) == NULL)
 449                                 bsdar_errc(bsdar, EX_SOFTWARE, errno,
 450                                     "basename failed");
 451                         if (bsdar->options & AR_TR) {
 452                                 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
 453                                         continue;
 454                         } else
 455                                 if (strcmp(bname, obj->name) != 0)
 456                                         continue;
 457
 458                         if (mode == 'r') {
 459                                 /*
 460                                  * if the new member is not qualified
 461                                  * to replace the old one, skip it.
 462                                  */
 463                                 nobj = create_obj_from_file(bsdar, *av,
 464                                     obj->mtime);
 465                                 if (nobj == NULL)
 466                                         goto skip_obj;
 467                         }
 468
 469                         if (bsdar->options & AR_V)
 470                                 (void)fprintf(stdout, "%c - %s\n", mode,
 471                                     *av);
 472
 473                         TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 474                         if (mode == 'd' || mode == 'r') {
 475                                 free(obj->maddr);
 476                                 free(obj->name);
 477                                 free(obj);
 478                         }
 479
 480                         if (mode == 'm')
 481                                 insert_obj(bsdar, obj, pos);
 482                         if (mode == 'r')
 483                                 insert_obj(bsdar, nobj, pos);
 484
 485                 skip_obj:
 486                         *av = NULL;
 487                         break;
 488                 }
 489
 490         }
 491
 492 new_archive:
 493         /*
 494          * When operating in mode 'r', directly add those user specified
 495          * objects which do not exist in current archive. When operating
 496          * in mode 'q', all objects specified in command line args are
 497          * appended to the archive, without comparing with existing ones.
 498          */
 499         for (i = 0; i < bsdar->argc; i++) {
 500                 av = &bsdar->argv[i];
 501                 if (*av != NULL && (mode == 'r' || mode == 'q')) {
 502                         nobj = create_obj_from_file(bsdar, *av, 0);
 503                         if (nobj != NULL)
 504                                 insert_obj(bsdar, nobj, pos);
 505                         if (bsdar->options & AR_V && nobj != NULL)
 506                                 (void)fprintf(stdout, "a - %s\n", *av);
 507                         *av = NULL;
 508                 }
 509         }
 510
 511 write_objs:
 512         write_objs(bsdar);
 513         write_cleanup(bsdar);
 514 }
 515
 516 /*
 517  * Memory cleaning up.
 518  */
 519 static void
 520 write_cleanup(struct bsdar *bsdar)
 521 {
 522         struct ar_obj           *obj, *obj_temp;
 523
 524         TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 525                 if (obj->fd == -1)
 526                         free(obj->maddr);
 527                 else
 528                         if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
 529                                 bsdar_warnc(bsdar, errno,
 530                                     "can't munmap file: %s", obj->name);
 531                 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 532                 free(obj->name);
 533                 free(obj);
 534         }
 535
 536         free(bsdar->as);
 537         free(bsdar->s_so);
 538         free(bsdar->s_sn);
 539         bsdar->as = NULL;
 540         bsdar->s_so = NULL;
 541         bsdar->s_sn = NULL;
 542 }
 543
 544 /*
 545  * Wrapper for archive_write_data().
 546  */
 547 static void
 548 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
 549 {
 550         if (archive_write_data(a, buf, s) != (ssize_t)s)
 551                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
 552                     archive_error_string(a));
 553 }
 554
 555 /*
 556  * Write the resulting archive members.
 557  */
 558 static void
 559 write_objs(struct bsdar *bsdar)
 560 {
 561         struct ar_obj           *obj;
 562         struct archive          *a;
 563         struct archive_entry    *entry;
 564         size_t s_sz;            /* size of archive symbol table. */
 565         size_t pm_sz;           /* size of pseudo members */
 566         int                      i, nr;
 567
 568         if (elf_version(EV_CURRENT) == EV_NONE)
 569                 bsdar_errc(bsdar, EX_SOFTWARE, 0,
 570                     "ELF library initialization failed: %s", elf_errmsg(-1));
 571
 572         bsdar->rela_off = 0;
 573
 574         /* Create archive symbol table and archive string table, if need. */
 575         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 576                 if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
 577                         create_symtab_entry(bsdar, obj->maddr, obj->size);
 578                 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
 579                         add_to_ar_str_table(bsdar, obj->name);
 580                 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
 581         }
 582
 583         /*
 584          * Pad the symbol name string table. It is treated specially because
 585          * symbol name table should be padded by a '\0', not the common '\n'
 586          * for other members. The size of sn table includes the pad bit.
 587          */
 588         if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
 589                 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 590
 591         /*
 592          * Archive string table is padded by a "\n" as the normal members.
 593          * The difference is that the size of archive string table counts
 594          * in the pad bit, while normal members' size fileds do not.
 595          */
 596         if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
 597                 bsdar->as[bsdar->as_sz++] = '\n';
 598
 599         /*
 600          * If there is a symbol table, calculate the size of pseudo members,
 601          * convert previously stored relative offsets to absolute ones, and
 602          * then make them Big Endian.
 603          *
 604          * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
 605          */
 606
 607         if (bsdar->s_cnt != 0) {
 608                 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
 609                 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
 610                 if (bsdar->as != NULL)
 611                         pm_sz += _ARHDR_LEN + bsdar->as_sz;
 612                 for (i = 0; (size_t)i < bsdar->s_cnt; i++)
 613                         *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
 614                             pm_sz);
 615         }
 616
 617         if ((a = archive_write_new()) == NULL)
 618                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
 619
 620         archive_write_set_format_ar_svr4(a);
 621
 622         /* The compression mode of the existing archive is used
 623          * for the result archive or if creating a new archive, we
 624          * do not compress archive by default. This default behavior can
 625          * be overrided by compression mode specified explicitly
 626          * through command line option `-j' or `-z'.
 627          */
 628         if (bsdar->options & AR_J)
 629                 bsdar->compression = ARCHIVE_COMPRESSION_BZIP2;
 630         if (bsdar->options & AR_Z)
 631                 bsdar->compression = ARCHIVE_COMPRESSION_GZIP;
 632         if (bsdar->compression == ARCHIVE_COMPRESSION_BZIP2)
 633                 archive_write_set_compression_bzip2(a);
 634         else if (bsdar->compression == ARCHIVE_COMPRESSION_GZIP)
 635                 archive_write_set_compression_gzip(a);
 636         else
 637                 archive_write_set_compression_none(a);
 638
 639         AC(archive_write_open_filename(a, bsdar->filename));
 640
 641         /*
 642          * write the archive symbol table, if there is one.
 643          * If options -s is explicitly specified or we are invoked
 644          * as ranlib, write the symbol table even if it is empty.
 645          */
 646         if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
 647             bsdar->options & AR_S) {
 648                 entry = archive_entry_new();
 649                 archive_entry_copy_pathname(entry, "/");
 650                 archive_entry_set_mtime(entry, time(NULL), 0);
 651                 archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
 652                     sizeof(uint32_t) + bsdar->s_sn_sz);
 653                 AC(archive_write_header(a, entry));
 654                 nr = htobe32(bsdar->s_cnt);
 655                 write_data(bsdar, a, &nr, sizeof(uint32_t));
 656                 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
 657                     bsdar->s_cnt);
 658                 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
 659                 archive_entry_free(entry);
 660         }
 661
 662         /* write the archive string table, if any. */
 663         if (bsdar->as != NULL) {
 664                 entry = archive_entry_new();
 665                 archive_entry_copy_pathname(entry, "//");
 666                 archive_entry_set_size(entry, bsdar->as_sz);
 667                 AC(archive_write_header(a, entry));
 668                 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
 669                 archive_entry_free(entry);
 670         }
 671
 672         /* write normal members. */
 673         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 674                 entry = archive_entry_new();
 675                 archive_entry_copy_pathname(entry, obj->name);
 676                 archive_entry_set_uid(entry, obj->uid);
 677                 archive_entry_set_gid(entry, obj->gid);
 678                 archive_entry_set_mode(entry, obj->md);
 679                 archive_entry_set_size(entry, obj->size);
 680                 archive_entry_set_mtime(entry, obj->mtime, 0);
 681                 archive_entry_set_dev(entry, obj->dev);
 682                 archive_entry_set_ino(entry, obj->ino);
 683                 archive_entry_set_filetype(entry, AE_IFREG);
 684                 AC(archive_write_header(a, entry));
 685                 write_data(bsdar, a, obj->maddr, obj->size);
 686                 archive_entry_free(entry);
 687         }
 688
 689         AC(archive_write_close(a));
 690         AC(archive_write_finish(a));
 691 }
 692
 693 /*
 694  * Extract global symbols from ELF binary members.
 695  */
 696 static void
 697 create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
 698 {
 699         Elf             *e;
 700         Elf_Scn         *scn;
 701         GElf_Shdr        shdr;
 702         GElf_Sym         sym;
 703         Elf_Data        *data;
 704         char            *name;
 705         size_t           n, shstrndx;
 706         int              elferr, tabndx, len, i;
 707
 708         if ((e = elf_memory(maddr, size)) == NULL) {
 709                 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
 710                      elf_errmsg(-1));
 711                 return;
 712         }
 713         if (elf_kind(e) != ELF_K_ELF) {
 714                 /* Sliently ignore non-elf member. */
 715                 elf_end(e);
 716                 return;
 717         }
 718         if (elf_getshstrndx(e, &shstrndx) == 0) {
 719                 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s",
 720                      elf_errmsg(-1));
 721                 elf_end(e);
 722                 return;
 723         }
 724
 725         tabndx = -1;
 726         scn = NULL;
 727         while ((scn = elf_nextscn(e, scn)) != NULL) {
 728                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 729                         bsdar_warnc(bsdar, 0,
 730                             "elf_getshdr failed: %s", elf_errmsg(-1));
 731                         continue;
 732                 }
 733                 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
 734                         bsdar_warnc(bsdar, 0,
 735                             "elf_strptr failed: %s", elf_errmsg(-1));
 736                         continue;
 737                 }
 738                 if (strcmp(name, ".strtab") == 0) {
 739                         tabndx = elf_ndxscn(scn);
 740                         break;
 741                 }
 742         }
 743         elferr = elf_errno();
 744         if (elferr != 0)
 745                 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
 746                      elf_errmsg(elferr));
 747         if (tabndx == -1) {
 748                 bsdar_warnc(bsdar, 0, "can't find .strtab section");
 749                 elf_end(e);
 750                 return;
 751         }
 752
 753         scn = NULL;
 754         while ((scn = elf_nextscn(e, scn)) != NULL) {
 755                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 756                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 757                             "elf_getshdr failed: %s", elf_errmsg(-1));
 758                         continue;
 759                 }
 760                 if (shdr.sh_type != SHT_SYMTAB)
 761                         continue;
 762
 763                 data = NULL;
 764                 n = 0;
 765                 while (n < shdr.sh_size &&
 766                     (data = elf_getdata(scn, data)) != NULL) {
 767                         len = data->d_size / shdr.sh_entsize;
 768                         for (i = 0; i < len; i++) {
 769                                 if (gelf_getsym(data, i, &sym) != &sym) {
 770                                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 771                                             "gelf_getsym failed: %s",
 772                                              elf_errmsg(-1));
 773                                         continue;
 774                                 }
 775
 776                                 /* keep only global or weak symbols */
 777                                 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
 778                                     GELF_ST_BIND(sym.st_info) != STB_WEAK)
 779                                         continue;
 780
 781                                 /* keep only defined symbols */
 782                                 if (sym.st_shndx == SHN_UNDEF)
 783                                         continue;
 784
 785                                 if ((name = elf_strptr(e, tabndx,
 786                                     sym.st_name)) == NULL) {
 787                                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 788                                             "elf_strptr failed: %s",
 789                                              elf_errmsg(-1));
 790                                         continue;
 791                                 }
 792
 793                                 add_to_ar_sym_table(bsdar, name);
 794                         }
 795                 }
 796         }
 797         elferr = elf_errno();
 798         if (elferr != 0)
 799                 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s",
 800                      elf_errmsg(elferr));
 801
 802         elf_end(e);
 803 }
 804
 805 /*
 806  * Append to the archive string table buffer.
 807  */
 808 static void
 809 add_to_ar_str_table(struct bsdar *bsdar, const char *name)
 810 {
 811
 812         if (bsdar->as == NULL) {
 813                 bsdar->as_cap = _INIT_AS_CAP;
 814                 bsdar->as_sz = 0;
 815                 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
 816                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 817         }
 818
 819         /*
 820          * The space required for holding one member name in as table includes:
 821          * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
 822          */
 823         while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
 824                 bsdar->as_cap *= 2;
 825                 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
 826                 if (bsdar->as == NULL)
 827                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 828         }
 829         strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
 830         bsdar->as_sz += strlen(name);
 831         bsdar->as[bsdar->as_sz++] = '/';
 832         bsdar->as[bsdar->as_sz++] = '\n';
 833 }
 834
 835 /*
 836  * Append to the archive symbol table buffer.
 837  */
 838 static void
 839 add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
 840 {
 841
 842         if (bsdar->s_so == NULL) {
 843                 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
 844                     NULL)
 845                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 846                 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
 847                 bsdar->s_cnt = 0;
 848         }
 849
 850         if (bsdar->s_sn == NULL) {
 851                 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
 852                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 853                 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
 854                 bsdar->s_sn_sz = 0;
 855         }
 856
 857         if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
 858                 bsdar->s_so_cap *= 2;
 859                 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
 860                 if (bsdar->s_so == NULL)
 861                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 862         }
 863         bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
 864         bsdar->s_cnt++;
 865
 866         /*
 867          * The space required for holding one symbol name in sn table includes:
 868          * strlen(name) + (1 for '\n') + (possibly 1 for padding).
 869          */
 870         while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
 871                 bsdar->s_sn_cap *= 2;
 872                 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
 873                 if (bsdar->s_sn == NULL)
 874                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 875         }
 876         strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
 877         bsdar->s_sn_sz += strlen(name);
 878         bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 879 }