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