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 specified.
 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         /*
 167          * When option '-D' is specified, mtime and UID / GID from the file
 168          * will be replaced with 0, and file mode with 644. This ensures that
 169          * checksums will match for two archives containing the exact same
 170          * files.
 171          */
 172         if (bsdar->options & AR_D) {
 173                 obj->uid = 0;
 174                 obj->gid = 0;
 175                 obj->mtime = 0;
 176                 obj->md = S_IFREG | 0644;
 177         } else {
 178                 obj->uid = sb.st_uid;
 179                 obj->gid = sb.st_gid;
 180                 obj->mtime = sb.st_mtime;
 181                 obj->md = sb.st_mode;
 182         }
 183         obj->size = sb.st_size;
 184         obj->dev = sb.st_dev;
 185         obj->ino = sb.st_ino;
 186
 187         if (obj->size == 0) {
 188                 obj->maddr = NULL;
 189                 return (obj);
 190         }
 191
 192         if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
 193             MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
 194                 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
 195                 goto giveup;
 196         }
 197         if (close(obj->fd) < 0)
 198                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
 199                     obj->name);
 200
 201         return (obj);
 202
 203 giveup:
 204         if (close(obj->fd) < 0)
 205                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
 206                     obj->name);
 207         free(obj->name);
 208         free(obj);
 209         return (NULL);
 210 }
 211
 212 /*
 213  * Insert obj to the tail, or before/after the pos obj.
 214  */
 215 static void
 216 insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
 217 {
 218         if (obj == NULL)
 219                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj");
 220
 221         if (pos == NULL || obj == pos)
 222                 /*
 223                  * If the object to move happens to be the position obj,
 224                  * or if there is not a pos obj, move it to tail.
 225                  */
 226                 goto tail;
 227
 228         if (bsdar->options & AR_B) {
 229                 TAILQ_INSERT_BEFORE(pos, obj, objs);
 230                 return;
 231         }
 232         if (bsdar->options & AR_A) {
 233                 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
 234                 return;
 235         }
 236
 237 tail:
 238         TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 239
 240 }
 241
 242 /*
 243  * Read objects from archive into v_obj list. Note that checkargv is
 244  * set when read_objs is used to read objects from the target of
 245  * ADDLIB command (ar script mode), in this case argv array possibly
 246  * specifies the members ADDLIB want.
 247  */
 248 static void
 249 read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
 250 {
 251         struct archive           *a;
 252         struct archive_entry     *entry;
 253         struct ar_obj            *obj;
 254         const char               *name;
 255         const char               *bname;
 256         char                     *buff;
 257         char                    **av;
 258         size_t                    size;
 259         int                       i, r, find;
 260
 261         if ((a = archive_read_new()) == NULL)
 262                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed");
 263         archive_read_support_compression_none(a);
 264         archive_read_support_format_ar(a);
 265         AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
 266         for (;;) {
 267                 r = archive_read_next_header(a, &entry);
 268                 if (r == ARCHIVE_FATAL)
 269                         bsdar_errc(bsdar, EX_DATAERR, 0, "%s",
 270                             archive_error_string(a));
 271                 if (r == ARCHIVE_EOF)
 272                         break;
 273                 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
 274                         bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
 275                 if (r == ARCHIVE_RETRY) {
 276                         bsdar_warnc(bsdar, 0, "Retrying...");
 277                         continue;
 278                 }
 279
 280                 name = archive_entry_pathname(entry);
 281
 282                 /*
 283                  * skip pseudo members.
 284                  */
 285                 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
 286                         continue;
 287
 288                 /*
 289                  * If checkargv is set, only read those members specified
 290                  * in argv.
 291                  */
 292                 if (checkargv && bsdar->argc > 0) {
 293                         find = 0;
 294                         for(i = 0; i < bsdar->argc; i++) {
 295                                 av = &bsdar->argv[i];
 296                                 if (*av == NULL)
 297                                         continue;
 298                                 if ((bname = basename(*av)) == NULL)
 299                                         bsdar_errc(bsdar, EX_SOFTWARE, errno,
 300                                             "basename failed");
 301                                 if (strcmp(bname, name) != 0)
 302                                         continue;
 303
 304                                 *av = NULL;
 305                                 find = 1;
 306                                 break;
 307                         }
 308                         if (!find)
 309                                 continue;
 310                 }
 311
 312                 size = archive_entry_size(entry);
 313
 314                 if (size > 0) {
 315                         if ((buff = malloc(size)) == NULL)
 316                                 bsdar_errc(bsdar, EX_SOFTWARE, errno,
 317                                     "malloc failed");
 318                         if (archive_read_data(a, buff, size) != (ssize_t)size) {
 319                                 bsdar_warnc(bsdar, 0, "%s",
 320                                     archive_error_string(a));
 321                                 free(buff);
 322                                 continue;
 323                         }
 324                 } else
 325                         buff = NULL;
 326
 327                 obj = malloc(sizeof(struct ar_obj));
 328                 if (obj == NULL)
 329                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 330                 obj->maddr = buff;
 331                 if ((obj->name = strdup(name)) == NULL)
 332                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
 333                 obj->size = size;
 334                 obj->uid = archive_entry_uid(entry);
 335                 obj->gid = archive_entry_gid(entry);
 336                 obj->md = archive_entry_mode(entry);
 337                 obj->mtime = archive_entry_mtime(entry);
 338                 obj->dev = 0;
 339                 obj->ino = 0;
 340
 341                 /*
 342                  * Objects from archive have obj->fd set to -1,
 343                  * for the ease of cleaning up.
 344                  */
 345                 obj->fd = -1;
 346                 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 347         }
 348         AC(archive_read_close(a));
 349         AC(archive_read_finish(a));
 350 }
 351
 352 /*
 353  * Determine the constitution of resulting archive.
 354  */
 355 static void
 356 write_archive(struct bsdar *bsdar, char mode)
 357 {
 358         struct ar_obj            *nobj, *obj, *obj_temp, *pos;
 359         struct stat               sb;
 360         const char               *bname;
 361         char                    **av;
 362         int                       i;
 363
 364         TAILQ_INIT(&bsdar->v_obj);
 365         nobj = NULL;
 366         pos = NULL;
 367         memset(&sb, 0, sizeof(sb));
 368
 369         /*
 370          * Test if the specified archive exists, to figure out
 371          * whether we are creating one here.
 372          */
 373         if (stat(bsdar->filename, &sb) != 0) {
 374                 if (errno != ENOENT) {
 375                         bsdar_warnc(bsdar, 0, "stat %s failed",
 376                             bsdar->filename);
 377                         return;
 378                 }
 379
 380                 /* We do not create archive in mode 'd', 'm' and 's'.  */
 381                 if (mode != 'r' && mode != 'q') {
 382                         bsdar_warnc(bsdar, 0, "%s: no such file",
 383                             bsdar->filename);
 384                         return;
 385                 }
 386
 387                 /* Issue a warning if -c is not specified when creating. */
 388                 if (!(bsdar->options & AR_C))
 389                         bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
 390                 goto new_archive;
 391         }
 392
 393         /*
 394          * First read members from existing archive.
 395          */
 396         read_objs(bsdar, bsdar->filename, 0);
 397
 398         /*
 399          * For mode 's', no member will be moved, deleted or replaced.
 400          */
 401         if (mode == 's')
 402                 goto write_objs;
 403
 404         /*
 405          * For mode 'q', we don't need to adjust existing members either.
 406          * Also, -a, -b and -i are ignored in this mode. New members are
 407          * always inserted at tail.
 408          */
 409         if (mode == 'q')
 410                 goto new_archive;
 411
 412         /*
 413          * Mode 'A' adds the contents of another archive to the tail of
 414          * current archive. Note that mode 'A' is a special mode for the
 415          * ADDLIB command of the ar script mode. Currently there is no
 416          * access to this function from the ar command line mode.
 417          */
 418         if (mode == 'A') {
 419                 /*
 420                  * Read objects from the target archive of ADDLIB command.
 421                  * If there are members specified in argv, read those members
 422                  * only, otherwise the entire archive will be read.
 423                  */
 424                 read_objs(bsdar, bsdar->addlib, 1);
 425                 goto write_objs;
 426         }
 427
 428         /*
 429          * Try to find the position member specified by user.
 430          */
 431         if (bsdar->options & AR_A || bsdar->options & AR_B) {
 432                 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 433                         if (strcmp(obj->name, bsdar->posarg) == 0) {
 434                                 pos = obj;
 435                                 break;
 436                         }
 437                 }
 438
 439                 /*
 440                  * If can't find `pos' specified by user,
 441                  * silently insert objects at tail.
 442                  */
 443                 if (pos == NULL)
 444                         bsdar->options &= ~(AR_A | AR_B);
 445         }
 446
 447         for (i = 0; i < bsdar->argc; i++) {
 448                 av = &bsdar->argv[i];
 449
 450                 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 451                         if ((bname = basename(*av)) == NULL)
 452                                 bsdar_errc(bsdar, EX_SOFTWARE, errno,
 453                                     "basename failed");
 454                         if (bsdar->options & AR_TR) {
 455                                 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
 456                                         continue;
 457                         } else
 458                                 if (strcmp(bname, obj->name) != 0)
 459                                         continue;
 460
 461                         if (mode == 'r') {
 462                                 /*
 463                                  * if the new member is not qualified
 464                                  * to replace the old one, skip it.
 465                                  */
 466                                 nobj = create_obj_from_file(bsdar, *av,
 467                                     obj->mtime);
 468                                 if (nobj == NULL)
 469                                         goto skip_obj;
 470                         }
 471
 472                         if (bsdar->options & AR_V)
 473                                 (void)fprintf(stdout, "%c - %s\n", mode,
 474                                     *av);
 475
 476                         TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 477                         if (mode == 'd' || mode == 'r') {
 478                                 free(obj->maddr);
 479                                 free(obj->name);
 480                                 free(obj);
 481                         }
 482
 483                         if (mode == 'm')
 484                                 insert_obj(bsdar, obj, pos);
 485                         if (mode == 'r')
 486                                 insert_obj(bsdar, nobj, pos);
 487
 488                 skip_obj:
 489                         *av = NULL;
 490                         break;
 491                 }
 492
 493         }
 494
 495 new_archive:
 496         /*
 497          * When operating in mode 'r', directly add those user specified
 498          * objects which do not exist in current archive. When operating
 499          * in mode 'q', all objects specified in command line args are
 500          * appended to the archive, without comparing with existing ones.
 501          */
 502         for (i = 0; i < bsdar->argc; i++) {
 503                 av = &bsdar->argv[i];
 504                 if (*av != NULL && (mode == 'r' || mode == 'q')) {
 505                         nobj = create_obj_from_file(bsdar, *av, 0);
 506                         if (nobj != NULL)
 507                                 insert_obj(bsdar, nobj, pos);
 508                         if (bsdar->options & AR_V && nobj != NULL)
 509                                 (void)fprintf(stdout, "a - %s\n", *av);
 510                         *av = NULL;
 511                 }
 512         }
 513
 514 write_objs:
 515         write_objs(bsdar);
 516         write_cleanup(bsdar);
 517 }
 518
 519 /*
 520  * Memory cleaning up.
 521  */
 522 static void
 523 write_cleanup(struct bsdar *bsdar)
 524 {
 525         struct ar_obj           *obj, *obj_temp;
 526
 527         TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 528                 if (obj->fd == -1)
 529                         free(obj->maddr);
 530                 else
 531                         if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
 532                                 bsdar_warnc(bsdar, errno,
 533                                     "can't munmap file: %s", obj->name);
 534                 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 535                 free(obj->name);
 536                 free(obj);
 537         }
 538
 539         free(bsdar->as);
 540         free(bsdar->s_so);
 541         free(bsdar->s_sn);
 542         bsdar->as = NULL;
 543         bsdar->s_so = NULL;
 544         bsdar->s_sn = NULL;
 545 }
 546
 547 /*
 548  * Wrapper for archive_write_data().
 549  */
 550 static void
 551 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
 552 {
 553         if (archive_write_data(a, buf, s) != (ssize_t)s)
 554                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
 555                     archive_error_string(a));
 556 }
 557
 558 /*
 559  * Write the resulting archive members.
 560  */
 561 static void
 562 write_objs(struct bsdar *bsdar)
 563 {
 564         struct ar_obj           *obj;
 565         struct archive          *a;
 566         struct archive_entry    *entry;
 567         size_t s_sz;            /* size of archive symbol table. */
 568         size_t pm_sz;           /* size of pseudo members */
 569         int                      i, nr;
 570
 571         if (elf_version(EV_CURRENT) == EV_NONE)
 572                 bsdar_errc(bsdar, EX_SOFTWARE, 0,
 573                     "ELF library initialization failed: %s", elf_errmsg(-1));
 574
 575         bsdar->rela_off = 0;
 576
 577         /* Create archive symbol table and archive string table, if need. */
 578         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 579                 if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
 580                         create_symtab_entry(bsdar, obj->maddr, obj->size);
 581                 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
 582                         add_to_ar_str_table(bsdar, obj->name);
 583                 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
 584         }
 585
 586         /*
 587          * Pad the symbol name string table. It is treated specially because
 588          * symbol name table should be padded by a '\0', not the common '\n'
 589          * for other members. The size of sn table includes the pad bit.
 590          */
 591         if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
 592                 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 593
 594         /*
 595          * Archive string table is padded by a "\n" as the normal members.
 596          * The difference is that the size of archive string table counts
 597          * in the pad bit, while normal members' size fileds do not.
 598          */
 599         if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
 600                 bsdar->as[bsdar->as_sz++] = '\n';
 601
 602         /*
 603          * If there is a symbol table, calculate the size of pseudo members,
 604          * convert previously stored relative offsets to absolute ones, and
 605          * then make them Big Endian.
 606          *
 607          * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
 608          */
 609
 610         if (bsdar->s_cnt != 0) {
 611                 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
 612                 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
 613                 if (bsdar->as != NULL)
 614                         pm_sz += _ARHDR_LEN + bsdar->as_sz;
 615                 for (i = 0; (size_t)i < bsdar->s_cnt; i++)
 616                         *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
 617                             pm_sz);
 618         }
 619
 620         if ((a = archive_write_new()) == NULL)
 621                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
 622
 623         archive_write_set_format_ar_svr4(a);
 624         archive_write_set_compression_none(a);
 625
 626         AC(archive_write_open_filename(a, bsdar->filename));
 627
 628         /*
 629          * write the archive symbol table, if there is one.
 630          * If options -s is explicitly specified or we are invoked
 631          * as ranlib, write the symbol table even if it is empty.
 632          */
 633         if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
 634             bsdar->options & AR_S) {
 635                 entry = archive_entry_new();
 636                 archive_entry_copy_pathname(entry, "/");
 637                 if ((bsdar->options & AR_D) == 0)
 638                         archive_entry_set_mtime(entry, time(NULL), 0);
 639                 archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
 640                     sizeof(uint32_t) + bsdar->s_sn_sz);
 641                 AC(archive_write_header(a, entry));
 642                 nr = htobe32(bsdar->s_cnt);
 643                 write_data(bsdar, a, &nr, sizeof(uint32_t));
 644                 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
 645                     bsdar->s_cnt);
 646                 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
 647                 archive_entry_free(entry);
 648         }
 649
 650         /* write the archive string table, if any. */
 651         if (bsdar->as != NULL) {
 652                 entry = archive_entry_new();
 653                 archive_entry_copy_pathname(entry, "//");
 654                 archive_entry_set_size(entry, bsdar->as_sz);
 655                 AC(archive_write_header(a, entry));
 656                 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
 657                 archive_entry_free(entry);
 658         }
 659
 660         /* write normal members. */
 661         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 662                 entry = archive_entry_new();
 663                 archive_entry_copy_pathname(entry, obj->name);
 664                 archive_entry_set_uid(entry, obj->uid);
 665                 archive_entry_set_gid(entry, obj->gid);
 666                 archive_entry_set_mode(entry, obj->md);
 667                 archive_entry_set_size(entry, obj->size);
 668                 archive_entry_set_mtime(entry, obj->mtime, 0);
 669                 archive_entry_set_dev(entry, obj->dev);
 670                 archive_entry_set_ino(entry, obj->ino);
 671                 archive_entry_set_filetype(entry, AE_IFREG);
 672                 AC(archive_write_header(a, entry));
 673                 write_data(bsdar, a, obj->maddr, obj->size);
 674                 archive_entry_free(entry);
 675         }
 676
 677         AC(archive_write_close(a));
 678         AC(archive_write_finish(a));
 679 }
 680
 681 /*
 682  * Extract global symbols from ELF binary members.
 683  */
 684 static void
 685 create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
 686 {
 687         Elf             *e;
 688         Elf_Scn         *scn;
 689         GElf_Shdr        shdr;
 690         GElf_Sym         sym;
 691         Elf_Data        *data;
 692         char            *name;
 693         size_t           n, shstrndx;
 694         int              elferr, tabndx, len, i;
 695
 696         if ((e = elf_memory(maddr, size)) == NULL) {
 697                 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
 698                      elf_errmsg(-1));
 699                 return;
 700         }
 701         if (elf_kind(e) != ELF_K_ELF) {
 702                 /* Silently ignore non-elf member. */
 703                 elf_end(e);
 704                 return;
 705         }
 706         if (elf_getshstrndx(e, &shstrndx) == 0) {
 707                 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s",
 708                      elf_errmsg(-1));
 709                 elf_end(e);
 710                 return;
 711         }
 712
 713         tabndx = -1;
 714         scn = NULL;
 715         while ((scn = elf_nextscn(e, scn)) != NULL) {
 716                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 717                         bsdar_warnc(bsdar, 0,
 718                             "elf_getshdr failed: %s", elf_errmsg(-1));
 719                         continue;
 720                 }
 721                 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
 722                         bsdar_warnc(bsdar, 0,
 723                             "elf_strptr failed: %s", elf_errmsg(-1));
 724                         continue;
 725                 }
 726                 if (strcmp(name, ".strtab") == 0) {
 727                         tabndx = elf_ndxscn(scn);
 728                         break;
 729                 }
 730         }
 731         elferr = elf_errno();
 732         if (elferr != 0)
 733                 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
 734                      elf_errmsg(elferr));
 735         if (tabndx == -1) {
 736                 bsdar_warnc(bsdar, 0, "can't find .strtab section");
 737                 elf_end(e);
 738                 return;
 739         }
 740
 741         scn = NULL;
 742         while ((scn = elf_nextscn(e, scn)) != NULL) {
 743                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 744                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 745                             "elf_getshdr failed: %s", elf_errmsg(-1));
 746                         continue;
 747                 }
 748                 if (shdr.sh_type != SHT_SYMTAB)
 749                         continue;
 750
 751                 data = NULL;
 752                 n = 0;
 753                 while (n < shdr.sh_size &&
 754                     (data = elf_getdata(scn, data)) != NULL) {
 755                         len = data->d_size / shdr.sh_entsize;
 756                         for (i = 0; i < len; i++) {
 757                                 if (gelf_getsym(data, i, &sym) != &sym) {
 758                                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 759                                             "gelf_getsym failed: %s",
 760                                              elf_errmsg(-1));
 761                                         continue;
 762                                 }
 763
 764                                 /* keep only global or weak symbols */
 765                                 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
 766                                     GELF_ST_BIND(sym.st_info) != STB_WEAK)
 767                                         continue;
 768
 769                                 /* keep only defined symbols */
 770                                 if (sym.st_shndx == SHN_UNDEF)
 771                                         continue;
 772
 773                                 if ((name = elf_strptr(e, tabndx,
 774                                     sym.st_name)) == NULL) {
 775                                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 776                                             "elf_strptr failed: %s",
 777                                              elf_errmsg(-1));
 778                                         continue;
 779                                 }
 780
 781                                 add_to_ar_sym_table(bsdar, name);
 782                         }
 783                 }
 784         }
 785         elferr = elf_errno();
 786         if (elferr != 0)
 787                 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s",
 788                      elf_errmsg(elferr));
 789
 790         elf_end(e);
 791 }
 792
 793 /*
 794  * Append to the archive string table buffer.
 795  */
 796 static void
 797 add_to_ar_str_table(struct bsdar *bsdar, const char *name)
 798 {
 799
 800         if (bsdar->as == NULL) {
 801                 bsdar->as_cap = _INIT_AS_CAP;
 802                 bsdar->as_sz = 0;
 803                 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
 804                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 805         }
 806
 807         /*
 808          * The space required for holding one member name in as table includes:
 809          * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
 810          */
 811         while (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
 812                 bsdar->as_cap *= 2;
 813                 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
 814                 if (bsdar->as == NULL)
 815                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 816         }
 817         strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
 818         bsdar->as_sz += strlen(name);
 819         bsdar->as[bsdar->as_sz++] = '/';
 820         bsdar->as[bsdar->as_sz++] = '\n';
 821 }
 822
 823 /*
 824  * Append to the archive symbol table buffer.
 825  */
 826 static void
 827 add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
 828 {
 829
 830         if (bsdar->s_so == NULL) {
 831                 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
 832                     NULL)
 833                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 834                 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
 835                 bsdar->s_cnt = 0;
 836         }
 837
 838         if (bsdar->s_sn == NULL) {
 839                 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
 840                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 841                 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
 842                 bsdar->s_sn_sz = 0;
 843         }
 844
 845         if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
 846                 bsdar->s_so_cap *= 2;
 847                 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
 848                 if (bsdar->s_so == NULL)
 849                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 850         }
 851         bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
 852         bsdar->s_cnt++;
 853
 854         /*
 855          * The space required for holding one symbol name in sn table includes:
 856          * strlen(name) + (1 for '\n') + (possibly 1 for padding).
 857          */
 858         while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
 859                 bsdar->s_sn_cap *= 2;
 860                 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
 861                 if (bsdar->s_sn == NULL)
 862                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 863         }
 864         strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
 865         bsdar->s_sn_sz += strlen(name);
 866         bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 867 }