usr.bin/ar/write.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2007 Kai Wang
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  26  * SUCH DAMAGE.
  27  */
  28
  29 #include <sys/cdefs.h>
  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 <assert.h>
  37 #include <errno.h>
  38 #include <fcntl.h>
  39 #include <gelf.h>
  40 #include <libgen.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45
  46 #include "ar.h"
  47
  48 #define _ARMAG_LEN 8            /* length of ar magic string */
  49 #define _ARHDR_LEN 60           /* length of ar header */
  50 #define _INIT_AS_CAP 128        /* initial archive string table size */
  51 #define _INIT_SYMOFF_CAP (256*(sizeof(uint64_t))) /* initial so table size */
  52 #define _INIT_SYMNAME_CAP 1024                    /* initial sn table size */
  53 #define _MAXNAMELEN_SVR4 15     /* max member name length in svr4 variant */
  54 #define _TRUNCATE_LEN 15        /* number of bytes to keep for member name */
  55
  56 static void     add_to_ar_str_table(struct bsdar *bsdar, const char *name);
  57 static void     add_to_ar_sym_table(struct bsdar *bsdar, const char *name);
  58 static struct ar_obj    *create_obj_from_file(struct bsdar *bsdar,
  59                     const char *name, time_t mtime);
  60 static void     create_symtab_entry(struct bsdar *bsdar, void *maddr,
  61                     size_t size);
  62 static void     free_obj(struct bsdar *bsdar, struct ar_obj *obj);
  63 static void     insert_obj(struct bsdar *bsdar, struct ar_obj *obj,
  64                     struct ar_obj *pos);
  65 static void     prefault_buffer(const char *buf, size_t s);
  66 static void     read_objs(struct bsdar *bsdar, const char *archive,
  67                     int checkargv);
  68 static void     write_cleanup(struct bsdar *bsdar);
  69 static void     write_data(struct bsdar *bsdar, struct archive *a,
  70                     const void *buf, size_t s);
  71 static void     write_objs(struct bsdar *bsdar);
  72
  73 /*
  74  * Create object from file, return created obj upon success, or NULL
  75  * when an error occurs or the member is not newer than existing
  76  * one while -u is specified.
  77  */
  78 static struct ar_obj *
  79 create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
  80 {
  81         struct ar_obj           *obj;
  82         struct stat              sb;
  83         const char              *bname;
  84         char                    *tmpname;
  85
  86         if (name == NULL)
  87                 return (NULL);
  88
  89         obj = malloc(sizeof(struct ar_obj));
  90         if (obj == NULL)
  91                 bsdar_errc(bsdar, errno, "malloc failed");
  92         if ((obj->fd = open(name, O_RDONLY, 0)) < 0) {
  93                 bsdar_warnc(bsdar, errno, "can't open file: %s", name);
  94                 free(obj);
  95                 return (NULL);
  96         }
  97
  98         tmpname = strdup(name);
  99         if (tmpname == NULL)
 100                 bsdar_errc(bsdar, errno, "strdup failed");
 101         if ((bname = basename(tmpname)) == NULL)
 102                 bsdar_errc(bsdar, errno, "basename failed");
 103         if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
 104                 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
 105                         bsdar_errc(bsdar, errno, "malloc failed");
 106                 (void)strncpy(obj->name, bname, _TRUNCATE_LEN);
 107                 obj->name[_TRUNCATE_LEN] = '\0';
 108         } else
 109                 if ((obj->name = strdup(bname)) == NULL)
 110                     bsdar_errc(bsdar, errno, "strdup failed");
 111         free(tmpname);
 112
 113         if (fstat(obj->fd, &sb) < 0) {
 114                 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
 115                 goto giveup;
 116         }
 117         if (!S_ISREG(sb.st_mode)) {
 118                 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
 119                 goto giveup;
 120         }
 121
 122         /*
 123          * When option '-u' is specified and member is not newer than the
 124          * existing one, the replacement will not happen. While if mtime == 0,
 125          * which indicates that this is to "replace a none exist member",
 126          * the replace will proceed regardless of '-u'.
 127          */
 128         if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
 129                 goto giveup;
 130
 131         /*
 132          * When option '-D' is specified, mtime and UID / GID from the file
 133          * will be replaced with 0, and file mode with 644. This ensures that
 134          * checksums will match for two archives containing the exact same
 135          * files.
 136          */
 137         if (bsdar->options & AR_D) {
 138                 obj->uid = 0;
 139                 obj->gid = 0;
 140                 obj->mtime = 0;
 141                 obj->md = S_IFREG | 0644;
 142         } else {
 143                 obj->uid = sb.st_uid;
 144                 obj->gid = sb.st_gid;
 145                 obj->mtime = sb.st_mtime;
 146                 obj->md = sb.st_mode;
 147         }
 148         obj->size = sb.st_size;
 149         obj->dev = sb.st_dev;
 150         obj->ino = sb.st_ino;
 151
 152         if (obj->size == 0) {
 153                 obj->maddr = NULL;
 154                 return (obj);
 155         }
 156
 157         if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
 158             MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
 159                 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
 160                 goto giveup;
 161         }
 162         if (close(obj->fd) < 0)
 163                 bsdar_errc(bsdar, errno, "close failed: %s",
 164                     obj->name);
 165
 166         return (obj);
 167
 168 giveup:
 169         if (close(obj->fd) < 0)
 170                 bsdar_errc(bsdar, errno, "close failed: %s",
 171                     obj->name);
 172         free(obj->name);
 173         free(obj);
 174         return (NULL);
 175 }
 176
 177 /*
 178  * Free object itself and its associated allocations.
 179  */
 180 static void
 181 free_obj(struct bsdar *bsdar, struct ar_obj *obj)
 182 {
 183         if (obj->fd == -1)
 184                 free(obj->maddr);
 185         else
 186                 if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
 187                         bsdar_warnc(bsdar, errno,
 188                             "can't munmap file: %s", obj->name);
 189         free(obj->name);
 190         free(obj);
 191 }
 192
 193 /*
 194  * Insert obj to the tail, or before/after the pos obj.
 195  */
 196 static void
 197 insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
 198 {
 199         if (obj == NULL)
 200                 bsdar_errc(bsdar, 0, "try to insert a null obj");
 201
 202         if (pos == NULL || obj == pos)
 203                 /*
 204                  * If the object to move happens to be the position obj,
 205                  * or if there is not a pos obj, move it to tail.
 206                  */
 207                 goto tail;
 208
 209         if (bsdar->options & AR_B) {
 210                 TAILQ_INSERT_BEFORE(pos, obj, objs);
 211                 return;
 212         }
 213         if (bsdar->options & AR_A) {
 214                 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
 215                 return;
 216         }
 217
 218 tail:
 219         TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 220
 221 }
 222
 223 /*
 224  * Read objects from archive into v_obj list. Note that checkargv is
 225  * set when read_objs is used to read objects from the target of
 226  * ADDLIB command (ar script mode), in this case argv array possibly
 227  * specifies the members ADDLIB want.
 228  */
 229 static void
 230 read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
 231 {
 232         struct archive           *a;
 233         struct archive_entry     *entry;
 234         struct ar_obj            *obj;
 235         const char               *name;
 236         const char               *bname;
 237         char                     *buff;
 238         char                    **av;
 239         size_t                    size;
 240         int                       i, r, find;
 241
 242         if ((a = archive_read_new()) == NULL)
 243                 bsdar_errc(bsdar, 0, "archive_read_new failed");
 244         archive_read_support_format_ar(a);
 245         AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
 246         for (;;) {
 247                 r = archive_read_next_header(a, &entry);
 248                 if (r == ARCHIVE_FATAL)
 249                         bsdar_errc(bsdar, archive_errno(a), "%s",
 250                             archive_error_string(a));
 251                 if (r == ARCHIVE_EOF)
 252                         break;
 253                 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
 254                         bsdar_warnc(bsdar, archive_errno(a), "%s",
 255                             archive_error_string(a));
 256                 if (r == ARCHIVE_RETRY) {
 257                         bsdar_warnc(bsdar, 0, "Retrying...");
 258                         continue;
 259                 }
 260
 261                 name = archive_entry_pathname(entry);
 262
 263                 /*
 264                  * skip pseudo members.
 265                  */
 266                 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
 267                         continue;
 268
 269                 /*
 270                  * If checkargv is set, only read those members specified
 271                  * in argv.
 272                  */
 273                 if (checkargv && bsdar->argc > 0) {
 274                         find = 0;
 275                         for(i = 0; i < bsdar->argc; i++) {
 276                                 av = &bsdar->argv[i];
 277                                 if (*av == NULL)
 278                                         continue;
 279                                 if ((bname = basename(*av)) == NULL)
 280                                         bsdar_errc(bsdar, errno,
 281                                             "basename failed");
 282                                 if (strcmp(bname, name) != 0)
 283                                         continue;
 284
 285                                 *av = NULL;
 286                                 find = 1;
 287                                 break;
 288                         }
 289                         if (!find)
 290                                 continue;
 291                 }
 292
 293                 size = archive_entry_size(entry);
 294
 295                 if (size > 0) {
 296                         if ((buff = malloc(size)) == NULL)
 297                                 bsdar_errc(bsdar, errno, "malloc failed");
 298                         if (archive_read_data(a, buff, size) != (ssize_t)size) {
 299                                 bsdar_warnc(bsdar, archive_errno(a), "%s",
 300                                     archive_error_string(a));
 301                                 free(buff);
 302                                 continue;
 303                         }
 304                 } else
 305                         buff = NULL;
 306
 307                 obj = malloc(sizeof(struct ar_obj));
 308                 if (obj == NULL)
 309                         bsdar_errc(bsdar, errno, "malloc failed");
 310                 obj->maddr = buff;
 311                 if ((obj->name = strdup(name)) == NULL)
 312                         bsdar_errc(bsdar, errno, "strdup failed");
 313                 obj->size = size;
 314                 obj->uid = archive_entry_uid(entry);
 315                 obj->gid = archive_entry_gid(entry);
 316                 obj->md = archive_entry_mode(entry);
 317                 obj->mtime = archive_entry_mtime(entry);
 318                 obj->dev = 0;
 319                 obj->ino = 0;
 320
 321                 /*
 322                  * Objects from archive have obj->fd set to -1,
 323                  * for the ease of cleaning up.
 324                  */
 325                 obj->fd = -1;
 326                 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 327         }
 328         AC(archive_read_close(a));
 329         AC(archive_read_free(a));
 330 }
 331
 332 /*
 333  * Determine the constitution of resulting archive.
 334  */
 335 int
 336 ar_write_archive(struct bsdar *bsdar, int mode)
 337 {
 338         struct ar_obj            *nobj, *obj, *obj_temp, *pos;
 339         struct stat               sb;
 340         const char               *bname;
 341         char                    **av;
 342         int                       exitcode, i;
 343
 344         TAILQ_INIT(&bsdar->v_obj);
 345         exitcode = EXIT_SUCCESS;
 346         nobj = NULL;
 347         pos = NULL;
 348         memset(&sb, 0, sizeof(sb));
 349
 350         assert(mode == 'A' || mode == 'd' || mode == 'm' || mode == 'q' ||
 351             mode == 'r' || mode == 's');
 352
 353         /*
 354          * Test if the specified archive exists, to figure out
 355          * whether we are creating one here.
 356          */
 357         if (stat(bsdar->filename, &sb) != 0) {
 358                 if (errno != ENOENT) {
 359                         bsdar_warnc(bsdar, 0, "stat %s failed",
 360                             bsdar->filename);
 361                         return (EXIT_FAILURE);
 362                 }
 363
 364                 /* We do not create archive in mode 'd', 'm' and 's'.  */
 365                 if (mode != 'r' && mode != 'q') {
 366                         bsdar_warnc(bsdar, 0, "%s: no such file",
 367                             bsdar->filename);
 368                         return (EXIT_FAILURE);
 369                 }
 370
 371                 /* Issue a warning if -c is not specified when creating. */
 372                 if (!(bsdar->options & AR_C))
 373                         bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
 374                 goto new_archive;
 375         }
 376
 377         /*
 378          * First read members from existing archive.
 379          */
 380         read_objs(bsdar, bsdar->filename, 0);
 381
 382         /*
 383          * For mode 's', no member will be moved, deleted or replaced.
 384          */
 385         if (mode == 's')
 386                 goto write_objs;
 387
 388         /*
 389          * For mode 'q', we don't need to adjust existing members either.
 390          * Also, -a, -b and -i are ignored in this mode. New members are
 391          * always inserted at tail.
 392          */
 393         if (mode == 'q')
 394                 goto new_archive;
 395
 396         /*
 397          * Mode 'A' adds the contents of another archive to the tail of
 398          * current archive. Note that mode 'A' is a special mode for the
 399          * ADDLIB command of the ar script mode. Currently there is no
 400          * access to this function from the ar command line mode.
 401          */
 402         if (mode == 'A') {
 403                 /*
 404                  * Read objects from the target archive of ADDLIB command.
 405                  * If there are members specified in argv, read those members
 406                  * only, otherwise the entire archive will be read.
 407                  */
 408                 read_objs(bsdar, bsdar->addlib, 1);
 409                 goto write_objs;
 410         }
 411
 412         /*
 413          * Try to find the position member specified by user.
 414          */
 415         if (bsdar->options & AR_A || bsdar->options & AR_B) {
 416                 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 417                         if (strcmp(obj->name, bsdar->posarg) == 0) {
 418                                 pos = obj;
 419                                 break;
 420                         }
 421                 }
 422
 423                 /*
 424                  * If can't find `pos' specified by user,
 425                  * silently insert objects at tail.
 426                  */
 427                 if (pos == NULL)
 428                         bsdar->options &= ~(AR_A | AR_B);
 429         }
 430
 431         for (i = 0; i < bsdar->argc; i++) {
 432                 av = &bsdar->argv[i];
 433
 434                 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 435                         if ((bname = basename(*av)) == NULL)
 436                                 bsdar_errc(bsdar, errno, "basename failed");
 437                         if (bsdar->options & AR_TR) {
 438                                 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
 439                                         continue;
 440                         } else
 441                                 if (strcmp(bname, obj->name) != 0)
 442                                         continue;
 443
 444                         if (mode == 'r') {
 445                                 /*
 446                                  * if the new member is not qualified
 447                                  * to replace the old one, skip it.
 448                                  */
 449                                 nobj = create_obj_from_file(bsdar, *av,
 450                                     obj->mtime);
 451                                 if (nobj == NULL) {
 452                                         exitcode = EXIT_FAILURE;
 453                                         goto skip_obj;
 454                                 }
 455                         }
 456
 457                         if (bsdar->options & AR_V)
 458                                 (void)fprintf(stdout, "%c - %s\n", mode,
 459                                     *av);
 460
 461                         TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 462                         if (mode == 'd' || mode == 'r')
 463                                 free_obj(bsdar, obj);
 464
 465                         if (mode == 'm')
 466                                 insert_obj(bsdar, obj, pos);
 467                         if (mode == 'r')
 468                                 insert_obj(bsdar, nobj, pos);
 469
 470                 skip_obj:
 471                         *av = NULL;
 472                         break;
 473                 }
 474
 475         }
 476
 477 new_archive:
 478         /*
 479          * When operating in mode 'r', directly add those user specified
 480          * objects which do not exist in current archive. When operating
 481          * in mode 'q', all objects specified in command line args are
 482          * appended to the archive, without comparing with existing ones.
 483          */
 484         for (i = 0; i < bsdar->argc; i++) {
 485                 av = &bsdar->argv[i];
 486                 if (*av != NULL && (mode == 'r' || mode == 'q')) {
 487                         nobj = create_obj_from_file(bsdar, *av, 0);
 488                         if (nobj == NULL) {
 489                                 exitcode = EXIT_FAILURE;
 490                                 *av = NULL;
 491                                 continue;
 492                         }
 493                         insert_obj(bsdar, nobj, pos);
 494                         if (bsdar->options & AR_V && nobj != NULL)
 495                                 (void)fprintf(stdout, "a - %s\n", *av);
 496                         *av = NULL;
 497                 }
 498         }
 499
 500 write_objs:
 501         write_objs(bsdar);
 502         write_cleanup(bsdar);
 503
 504         return (exitcode);
 505 }
 506
 507 /*
 508  * Memory cleaning up.
 509  */
 510 static void
 511 write_cleanup(struct bsdar *bsdar)
 512 {
 513         struct ar_obj           *obj, *obj_temp;
 514
 515         TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 516                 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 517                 free_obj(bsdar, obj);
 518         }
 519
 520         free(bsdar->as);
 521         free(bsdar->s_so);
 522         free(bsdar->s_sn);
 523         bsdar->as = NULL;
 524         bsdar->s_so = NULL;
 525         bsdar->s_so_max = 0;
 526         bsdar->s_sn = NULL;
 527 }
 528
 529 /*
 530  * Fault in the buffer prior to writing as a workaround for poor performance
 531  * due to interaction with kernel fs deadlock avoidance code. See the comment
 532  * above vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the issue.
 533  */
 534 static void
 535 prefault_buffer(const char *buf, size_t s)
 536 {
 537         volatile const char *p;
 538         size_t page_size;
 539
 540         if (s == 0)
 541                 return;
 542         page_size = sysconf(_SC_PAGESIZE);
 543         for (p = buf; p < buf + s; p += page_size)
 544                 *p;
 545         /*
 546          * Ensure we touch the last page as well, in case the buffer is not
 547          * page-aligned.
 548          */
 549         *(volatile const char *)(buf + s - 1);
 550 }
 551
 552 /*
 553  * Wrapper for archive_write_data().
 554  */
 555 static void
 556 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
 557 {
 558         ssize_t written;
 559
 560         prefault_buffer(buf, s);
 561         while (s > 0) {
 562                 written = archive_write_data(a, buf, s);
 563                 if (written < 0)
 564                         bsdar_errc(bsdar, archive_errno(a), "%s",
 565                             archive_error_string(a));
 566                 buf = (const char *)buf + written;
 567                 s -= written;
 568         }
 569 }
 570
 571 /*
 572  * Write the resulting archive members.
 573  */
 574 static void
 575 write_objs(struct bsdar *bsdar)
 576 {
 577         struct ar_obj           *obj;
 578         struct archive          *a;
 579         struct archive_entry    *entry;
 580         size_t s_sz;            /* size of archive symbol table. */
 581         size_t pm_sz;           /* size of pseudo members */
 582         size_t w_sz;            /* size of words in symbol table */
 583         size_t                   i;
 584         uint64_t                 nr;
 585         uint32_t                 nr32;
 586
 587         if (elf_version(EV_CURRENT) == EV_NONE)
 588                 bsdar_errc(bsdar, 0, "ELF library initialization failed: %s",
 589                     elf_errmsg(-1));
 590
 591         bsdar->rela_off = 0;
 592
 593         /* Create archive symbol table and archive string table, if need. */
 594         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 595                 if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
 596                         create_symtab_entry(bsdar, obj->maddr, obj->size);
 597                 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
 598                         add_to_ar_str_table(bsdar, obj->name);
 599                 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
 600         }
 601
 602         /*
 603          * Pad the symbol name string table. It is treated specially because
 604          * symbol name table should be padded by a '\0', not the common '\n'
 605          * for other members. The size of sn table includes the pad bit.
 606          */
 607         if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
 608                 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 609
 610         /*
 611          * Archive string table is padded by a "\n" as the normal members.
 612          * The difference is that the size of archive string table counts
 613          * in the pad bit, while normal members' size fields do not.
 614          */
 615         if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
 616                 bsdar->as[bsdar->as_sz++] = '\n';
 617
 618         /*
 619          * If there is a symbol table, calculate the size of pseudo members,
 620          * convert previously stored relative offsets to absolute ones, and
 621          * then make them Big Endian.
 622          *
 623          * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
 624          */
 625         w_sz = sizeof(uint32_t);
 626         if (bsdar->s_cnt != 0) {
 627                 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
 628                 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
 629                 if (bsdar->as != NULL)
 630                         pm_sz += _ARHDR_LEN + bsdar->as_sz;
 631                 /* Use the 64-bit word size format if necessary. */
 632                 if (bsdar->s_so_max > UINT32_MAX - pm_sz) {
 633                         w_sz = sizeof(uint64_t);
 634                         pm_sz -= s_sz;
 635                         s_sz = (bsdar->s_cnt + 1) * sizeof(uint64_t) +
 636                             bsdar->s_sn_sz;
 637                         pm_sz += s_sz;
 638                         /* Convert to big-endian. */
 639                         for (i = 0; i < bsdar->s_cnt; i++)
 640                                 bsdar->s_so[i] =
 641                                     htobe64(bsdar->s_so[i] + pm_sz);
 642                 } else {
 643                         /*
 644                          * Convert to big-endian and shuffle in-place to
 645                          * the front of the allocation. XXX UB
 646                          */
 647                         for (i = 0; i < bsdar->s_cnt; i++)
 648                                 ((uint32_t *)(bsdar->s_so))[i] =
 649                                     htobe32(bsdar->s_so[i] + pm_sz);
 650                 }
 651         }
 652
 653         if ((a = archive_write_new()) == NULL)
 654                 bsdar_errc(bsdar, 0, "archive_write_new failed");
 655
 656         archive_write_set_format_ar_svr4(a);
 657
 658         AC(archive_write_open_filename(a, bsdar->filename));
 659
 660         /*
 661          * write the archive symbol table, if there is one.
 662          * If options -s is explicitly specified or we are invoked
 663          * as ranlib, write the symbol table even if it is empty.
 664          */
 665         if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
 666             bsdar->options & AR_S) {
 667                 entry = archive_entry_new();
 668                 if (entry == NULL)
 669                         bsdar_errc(bsdar, 0, "archive_entry_new failed");
 670                 if (w_sz == sizeof(uint64_t))
 671                         archive_entry_copy_pathname(entry, "/SYM64/");
 672                 else
 673                         archive_entry_copy_pathname(entry, "/");
 674                 if ((bsdar->options & AR_D) == 0)
 675                         archive_entry_set_mtime(entry, time(NULL), 0);
 676                 archive_entry_set_size(entry, (bsdar->s_cnt + 1) * w_sz +
 677                     bsdar->s_sn_sz);
 678                 AC(archive_write_header(a, entry));
 679                 if (w_sz == sizeof(uint64_t)) {
 680                         nr = htobe64(bsdar->s_cnt);
 681                         write_data(bsdar, a, &nr, sizeof(nr));
 682                 } else {
 683                         nr32 = htobe32((uint32_t)bsdar->s_cnt);
 684                         write_data(bsdar, a, &nr32, sizeof(nr32));
 685                 }
 686                 write_data(bsdar, a, bsdar->s_so, w_sz * bsdar->s_cnt);
 687                 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
 688                 archive_entry_free(entry);
 689         }
 690
 691         /* write the archive string table, if any. */
 692         if (bsdar->as != NULL) {
 693                 entry = archive_entry_new();
 694                 if (entry == NULL)
 695                         bsdar_errc(bsdar, 0, "archive_entry_new failed");
 696                 archive_entry_copy_pathname(entry, "//");
 697                 archive_entry_set_size(entry, bsdar->as_sz);
 698                 AC(archive_write_header(a, entry));
 699                 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
 700                 archive_entry_free(entry);
 701         }
 702
 703         /* write normal members. */
 704         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 705                 entry = archive_entry_new();
 706                 if (entry == NULL)
 707                         bsdar_errc(bsdar, 0, "archive_entry_new failed");
 708                 archive_entry_copy_pathname(entry, obj->name);
 709                 archive_entry_set_uid(entry, obj->uid);
 710                 archive_entry_set_gid(entry, obj->gid);
 711                 archive_entry_set_mode(entry, obj->md);
 712                 archive_entry_set_size(entry, obj->size);
 713                 archive_entry_set_mtime(entry, obj->mtime, 0);
 714                 archive_entry_set_dev(entry, obj->dev);
 715                 archive_entry_set_ino(entry, obj->ino);
 716                 archive_entry_set_filetype(entry, AE_IFREG);
 717                 AC(archive_write_header(a, entry));
 718                 write_data(bsdar, a, obj->maddr, obj->size);
 719                 archive_entry_free(entry);
 720         }
 721
 722         AC(archive_write_close(a));
 723         AC(archive_write_free(a));
 724 }
 725
 726 /*
 727  * Extract global symbols from ELF binary members.
 728  */
 729 static void
 730 create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
 731 {
 732         Elf             *e;
 733         Elf_Scn         *scn;
 734         GElf_Shdr        shdr;
 735         GElf_Sym         sym;
 736         Elf_Data        *data;
 737         char            *name;
 738         size_t           n, shstrndx;
 739         int              elferr, tabndx, len, i;
 740
 741         if ((e = elf_memory(maddr, size)) == NULL) {
 742                 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
 743                      elf_errmsg(-1));
 744                 return;
 745         }
 746         if (elf_kind(e) != ELF_K_ELF) {
 747                 /* Silently ignore non-elf member. */
 748                 elf_end(e);
 749                 return;
 750         }
 751         if (elf_getshstrndx(e, &shstrndx) == 0) {
 752                 bsdar_warnc(bsdar, 0, "elf_getshstrndx failed: %s",
 753                      elf_errmsg(-1));
 754                 elf_end(e);
 755                 return;
 756         }
 757
 758         tabndx = -1;
 759         scn = NULL;
 760         while ((scn = elf_nextscn(e, scn)) != NULL) {
 761                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 762                         bsdar_warnc(bsdar, 0,
 763                             "elf_getshdr failed: %s", elf_errmsg(-1));
 764                         continue;
 765                 }
 766                 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
 767                         bsdar_warnc(bsdar, 0,
 768                             "elf_strptr failed: %s", elf_errmsg(-1));
 769                         continue;
 770                 }
 771                 if (strcmp(name, ".strtab") == 0) {
 772                         tabndx = elf_ndxscn(scn);
 773                         break;
 774                 }
 775         }
 776         elferr = elf_errno();
 777         if (elferr != 0)
 778                 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
 779                      elf_errmsg(elferr));
 780         if (tabndx == -1) {
 781                 bsdar_warnc(bsdar, 0, "can't find .strtab section");
 782                 elf_end(e);
 783                 return;
 784         }
 785
 786         scn = NULL;
 787         while ((scn = elf_nextscn(e, scn)) != NULL) {
 788                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 789                         bsdar_warnc(bsdar, 0, "elf_getshdr failed: %s",
 790                             elf_errmsg(-1));
 791                         continue;
 792                 }
 793                 if (shdr.sh_type != SHT_SYMTAB)
 794                         continue;
 795
 796                 data = NULL;
 797                 n = 0;
 798                 while (n < shdr.sh_size &&
 799                     (data = elf_getdata(scn, data)) != NULL) {
 800                         len = data->d_size / shdr.sh_entsize;
 801                         for (i = 0; i < len; i++) {
 802                                 if (gelf_getsym(data, i, &sym) != &sym) {
 803                                         bsdar_warnc(bsdar, 0,
 804                                             "gelf_getsym failed: %s",
 805                                              elf_errmsg(-1));
 806                                         continue;
 807                                 }
 808
 809                                 /* keep only global or weak symbols */
 810                                 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
 811                                     GELF_ST_BIND(sym.st_info) != STB_WEAK)
 812                                         continue;
 813
 814                                 /* keep only defined symbols */
 815                                 if (sym.st_shndx == SHN_UNDEF)
 816                                         continue;
 817
 818                                 if ((name = elf_strptr(e, tabndx,
 819                                     sym.st_name)) == NULL) {
 820                                         bsdar_warnc(bsdar, 0,
 821                                             "elf_strptr failed: %s",
 822                                              elf_errmsg(-1));
 823                                         continue;
 824                                 }
 825
 826                                 add_to_ar_sym_table(bsdar, name);
 827                         }
 828                 }
 829         }
 830         elferr = elf_errno();
 831         if (elferr != 0)
 832                 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
 833                      elf_errmsg(elferr));
 834
 835         elf_end(e);
 836 }
 837
 838 /*
 839  * Append to the archive string table buffer.
 840  */
 841 static void
 842 add_to_ar_str_table(struct bsdar *bsdar, const char *name)
 843 {
 844
 845         if (bsdar->as == NULL) {
 846                 bsdar->as_cap = _INIT_AS_CAP;
 847                 bsdar->as_sz = 0;
 848                 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
 849                         bsdar_errc(bsdar, errno, "malloc failed");
 850         }
 851
 852         /*
 853          * The space required for holding one member name in as table includes:
 854          * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
 855          */
 856         while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
 857                 bsdar->as_cap *= 2;
 858                 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
 859                 if (bsdar->as == NULL)
 860                         bsdar_errc(bsdar, errno, "realloc failed");
 861         }
 862         strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
 863         bsdar->as_sz += strlen(name);
 864         bsdar->as[bsdar->as_sz++] = '/';
 865         bsdar->as[bsdar->as_sz++] = '\n';
 866 }
 867
 868 /*
 869  * Append to the archive symbol table buffer.
 870  */
 871 static void
 872 add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
 873 {
 874
 875         if (bsdar->s_so == NULL) {
 876                 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
 877                     NULL)
 878                         bsdar_errc(bsdar, errno, "malloc failed");
 879                 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
 880                 bsdar->s_cnt = 0;
 881         }
 882
 883         if (bsdar->s_sn == NULL) {
 884                 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
 885                         bsdar_errc(bsdar, errno, "malloc failed");
 886                 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
 887                 bsdar->s_sn_sz = 0;
 888         }
 889
 890         if (bsdar->s_cnt * sizeof(uint64_t) >= bsdar->s_so_cap) {
 891                 bsdar->s_so_cap *= 2;
 892                 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
 893                 if (bsdar->s_so == NULL)
 894                         bsdar_errc(bsdar, errno, "realloc failed");
 895         }
 896         bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
 897         if ((uint64_t)bsdar->rela_off > bsdar->s_so_max)
 898                 bsdar->s_so_max = (uint64_t)bsdar->rela_off;
 899         bsdar->s_cnt++;
 900
 901         /*
 902          * The space required for holding one symbol name in sn table includes:
 903          * strlen(name) + (1 for '\n') + (possibly 1 for padding).
 904          */
 905         while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
 906                 bsdar->s_sn_cap *= 2;
 907                 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
 908                 if (bsdar->s_sn == NULL)
 909                         bsdar_errc(bsdar, errno, "realloc failed");
 910         }
 911         strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
 912         bsdar->s_sn_sz += strlen(name);
 913         bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 914 }