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     write_archive(struct bsdar *bsdar, char mode);
  64 static void     write_cleanup(struct bsdar *bsdar);
  65 static void     write_data(struct bsdar *bsdar, struct archive *a,
  66                     const void *buf, size_t s);
  67 static void     write_objs(struct bsdar *bsdar);
  68
  69 void
  70 ar_mode_d(struct bsdar *bsdar)
  71 {
  72
  73         write_archive(bsdar, 'd');
  74 }
  75
  76 void
  77 ar_mode_m(struct bsdar *bsdar)
  78 {
  79
  80         write_archive(bsdar, 'm');
  81 }
  82
  83 void
  84 ar_mode_r(struct bsdar *bsdar)
  85 {
  86
  87         write_archive(bsdar, 'r');
  88 }
  89
  90 void
  91 ar_mode_s(struct bsdar *bsdar)
  92 {
  93
  94         write_archive(bsdar, 's');
  95 }
  96
  97 /*
  98  * Create object from file, return created obj upon success, or NULL
  99  * when an error occurs or the member is not newer than existing
 100  * one while -u is specifed.
 101  */
 102 static struct ar_obj *
 103 create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
 104 {
 105         struct ar_obj           *obj;
 106         struct stat              sb;
 107         const char              *bname;
 108
 109         if (name == NULL)
 110                 return(NULL);
 111
 112         obj = malloc(sizeof(struct ar_obj));
 113         if (obj == NULL)
 114                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 115         if ((obj->fd = open(name, O_RDONLY, 0)) < 0) {
 116                 bsdar_warnc(bsdar, errno, "can't open file: %s", name);
 117                 free(obj);
 118                 return(NULL);
 119         }
 120
 121         if ((bname = basename(name)) == NULL)
 122                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed");
 123         if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
 124                 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
 125                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 126                 (void)strncpy(obj->name, bname, _TRUNCATE_LEN);
 127                 obj->name[_TRUNCATE_LEN] = '\0';
 128         } else
 129                 if ((obj->name = strdup(bname)) == NULL)
 130                     bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
 131
 132         if (fstat(obj->fd, &sb) < 0) {
 133                 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
 134                 goto giveup;
 135         }
 136         if (!S_ISREG(sb.st_mode)) {
 137                 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
 138                 goto giveup;
 139         }
 140
 141         /*
 142          * When option '-u' is specified and member is not newer than the
 143          * existing one, the replace will not happen. While if mtime == 0,
 144          * which indicates that this is to "replace a none exist member",
 145          * the replace will proceed regardless of '-u'.
 146          */
 147         if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
 148                 goto giveup;
 149
 150         obj->uid = sb.st_uid;
 151         obj->gid = sb.st_gid;
 152         obj->md = sb.st_mode;
 153         obj->size = sb.st_size;
 154         obj->mtime = sb.st_mtime;
 155         obj->dev = sb.st_dev;
 156         obj->ino = sb.st_ino;
 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, EX_SOFTWARE, errno, "close failed: %s",
 164                     obj->name);
 165
 166         return(obj);
 167
 168 giveup:
 169         if (close(obj->fd) < 0)
 170                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
 171                     obj->name);
 172         free(obj->name);
 173         free(obj);
 174         return(NULL);
 175 }
 176
 177 /*
 178  * Insert obj to the tail, or before/after the pos obj.
 179  */
 180 static void
 181 insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
 182 {
 183         if (obj == NULL)
 184                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj");
 185
 186         if (pos == NULL || obj == pos)
 187                 /*
 188                  * If the object to move happens to be the posistion obj,
 189                  * or if there is not a pos obj, move it to tail.
 190                  */
 191                 goto tail;
 192
 193         if (bsdar->options & AR_B) {
 194                 TAILQ_INSERT_BEFORE(pos, obj, objs);
 195                 return;
 196         }
 197         if (bsdar->options & AR_A) {
 198                 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
 199                 return;
 200         }
 201
 202 tail:
 203         TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 204
 205 }
 206
 207 /*
 208  * Determine the constitution of resulting archive.
 209  */
 210 static void
 211 write_archive(struct bsdar *bsdar, char mode)
 212 {
 213         struct archive           *a;
 214         struct archive_entry     *entry;
 215         struct ar_obj            *nobj, *obj, *obj_temp, *pos;
 216         struct stat               sb;
 217         const char               *name;
 218         const char               *bname;
 219         char                     *buff;
 220         char                    **av;
 221         size_t                    size;
 222         int                       i, r;
 223
 224         TAILQ_INIT(&bsdar->v_obj);
 225         nobj = NULL;
 226         pos = NULL;
 227         memset(&sb, 0, sizeof(sb));
 228
 229         /* By default, no compression is assumed. */
 230         bsdar->compression = ARCHIVE_COMPRESSION_NONE;
 231
 232         /*
 233          * Test if the specified archive exists, to figure out
 234          * whether we are creating one here.
 235          */
 236         if (stat(bsdar->filename, &sb) != 0) {
 237                 if (errno != ENOENT) {
 238                         bsdar_warnc(bsdar, 0, "stat %s failed",
 239                             bsdar->filename);
 240                         return;
 241                 }
 242
 243                 /* We do not create archive in mode 'd', 'm' and 's'.  */
 244                 if (mode != 'r') {
 245                         bsdar_warnc(bsdar, 0, "%s: no such file",
 246                             bsdar->filename);
 247                         return;
 248                 }
 249
 250                 /* Issue a warning if -c is not specified when creating. */
 251                 if (!(bsdar->options & AR_C))
 252                         bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
 253                 goto new_archive;
 254         }
 255
 256         /*
 257          * First read members from existing archive.
 258          */
 259         if ((a = archive_read_new()) == NULL)
 260                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed");
 261         archive_read_support_compression_all(a);
 262         archive_read_support_format_ar(a);
 263         AC(archive_read_open_filename(a, bsdar->filename, DEF_BLKSZ));
 264         for (;;) {
 265                 r = archive_read_next_header(a, &entry);
 266                 if (r == ARCHIVE_FATAL)
 267                         bsdar_errc(bsdar, EX_DATAERR, 0, "%s",
 268                             archive_error_string(a));
 269                 if (r == ARCHIVE_EOF)
 270                         break;
 271                 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
 272                         bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
 273                 if (r == ARCHIVE_RETRY) {
 274                         bsdar_warnc(bsdar, 0, "Retrying...");
 275                         continue;
 276                 }
 277
 278                 /*
 279                  * Remember the compression mode of existing archive.
 280                  * If neither -j nor -z is specified, this mode will
 281                  * be used for resulting archive.
 282                  */
 283                 bsdar->compression = archive_compression(a);
 284
 285                 name = archive_entry_pathname(entry);
 286
 287                 /*
 288                  * skip pseudo members.
 289                  */
 290                 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
 291                         continue;
 292
 293                 size = archive_entry_size(entry);
 294
 295                 if ((buff = malloc(size)) == NULL)
 296                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 297                 if (archive_read_data(a, buff, size) != (ssize_t)size) {
 298                         bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
 299                         free(buff);
 300                         continue;
 301                 }
 302                 obj = malloc(sizeof(struct ar_obj));
 303                 if (obj == NULL)
 304                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 305                 obj->maddr = buff;
 306                 if ((obj->name = strdup(name)) == NULL)
 307                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
 308                 obj->size = size;
 309                 obj->uid = archive_entry_uid(entry);
 310                 obj->gid = archive_entry_gid(entry);
 311                 obj->md = archive_entry_mode(entry);
 312                 obj->mtime = archive_entry_mtime(entry);
 313                 obj->dev = 0;
 314                 obj->ino = 0;
 315
 316                 /*
 317                  * Objects from archive have obj->fd set to -1,
 318                  * for the ease of cleaning up.
 319                  */
 320                 obj->fd = -1;
 321                 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 322         }
 323         AC(archive_read_close(a));
 324         AC(archive_read_finish(a));
 325
 326         /*
 327          * For mode 's', no member will be moved, deleted or replaced.
 328          */
 329         if (mode == 's')
 330                 goto write_objs;
 331
 332         /*
 333          * Try to find the position member specified by user.
 334          */
 335         if (bsdar->options & AR_A || bsdar->options & AR_B) {
 336                 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 337                         if (strcmp(obj->name, bsdar->posarg) == 0) {
 338                                 pos = obj;
 339                                 break;
 340                         }
 341                 }
 342
 343                 /*
 344                  * If can't find `pos' specified by user,
 345                  * sliently insert objects at tail.
 346                  */
 347                 if (pos == NULL)
 348                         bsdar->options &= ~(AR_A | AR_B);
 349         }
 350
 351         for (i = 0; i < bsdar->argc; i++) {
 352                 av = &bsdar->argv[i];
 353
 354                 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 355                         if ((bname = basename(*av)) == NULL)
 356                                 bsdar_errc(bsdar, EX_SOFTWARE, errno,
 357                                     "basename failed");
 358                         if (bsdar->options & AR_TR) {
 359                                 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
 360                                         continue;
 361                         } else
 362                                 if (strcmp(bname, obj->name) != 0)
 363                                         continue;
 364
 365                         if (mode == 'r') {
 366                                 /*
 367                                  * if the new member is not qualified
 368                                  * to replace the old one, skip it.
 369                                  */
 370                                 nobj = create_obj_from_file(bsdar, *av,
 371                                     obj->mtime);
 372                                 if (nobj == NULL)
 373                                         goto skip_obj;
 374                         }
 375
 376                         if (bsdar->options & AR_V)
 377                                 (void)fprintf(stdout, "%c - %s\n", mode,
 378                                     *av);
 379
 380                         TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 381                         if (mode == 'd' || mode == 'r') {
 382                                 free(obj->maddr);
 383                                 free(obj->name);
 384                                 free(obj);
 385                         }
 386
 387                         if (mode == 'm')
 388                                 insert_obj(bsdar, obj, pos);
 389                         if (mode == 'r')
 390                                 insert_obj(bsdar, nobj, pos);
 391
 392                 skip_obj:
 393                         *av = NULL;
 394                         break;
 395                 }
 396
 397         }
 398
 399 new_archive:
 400         /*
 401          * When operating in mode 'r', directly add those user specified
 402          * objects which do not exist in current archive.
 403          */
 404         for (i = 0; i < bsdar->argc; i++) {
 405                 av = &bsdar->argv[i];
 406                 if (*av != NULL && mode == 'r') {
 407                         nobj = create_obj_from_file(bsdar, *av, 0);
 408                         if (nobj != NULL)
 409                                 insert_obj(bsdar, nobj, pos);
 410                         if (bsdar->options & AR_V && nobj != NULL)
 411                                 (void)fprintf(stdout, "a - %s\n", *av);
 412                         *av = NULL;
 413                 }
 414         }
 415
 416 write_objs:
 417         write_objs(bsdar);
 418         write_cleanup(bsdar);
 419 }
 420
 421 /*
 422  * Memory cleaning up.
 423  */
 424 static void
 425 write_cleanup(struct bsdar *bsdar)
 426 {
 427         struct ar_obj           *obj, *obj_temp;
 428
 429         TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 430                 free(obj->name);
 431                 if (obj->fd == -1)
 432                         free(obj->maddr);
 433                 else
 434                         if (munmap(obj->maddr, obj->size))
 435                                 bsdar_warnc(bsdar, errno,
 436                                     "can't munmap file: %s", obj->name);
 437                 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 438                 free(obj);
 439         }
 440
 441         free(bsdar->as);
 442         free(bsdar->s_so);
 443         free(bsdar->s_sn);
 444         bsdar->as = NULL;
 445         bsdar->s_so = NULL;
 446         bsdar->s_sn = NULL;
 447 }
 448
 449 /*
 450  * Wrapper for archive_write_data().
 451  */
 452 static void
 453 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
 454 {
 455         if (archive_write_data(a, buf, s) != (ssize_t)s)
 456                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
 457                     archive_error_string(a));
 458 }
 459
 460 /*
 461  * Write the resulting archive members.
 462  */
 463 static void
 464 write_objs(struct bsdar *bsdar)
 465 {
 466         struct ar_obj           *obj;
 467         struct archive          *a;
 468         struct archive_entry    *entry;
 469         size_t s_sz;            /* size of archive symbol table. */
 470         size_t pm_sz;           /* size of pseudo members */
 471         int                      i, nr;
 472
 473         if (elf_version(EV_CURRENT) == EV_NONE)
 474                 bsdar_errc(bsdar, EX_SOFTWARE, 0,
 475                     "ELF library initialization failed: %s", elf_errmsg(-1));
 476
 477         bsdar->rela_off = 0;
 478
 479         /* Create archive symbol table and archive string table, if need. */
 480         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 481                 if (!(bsdar->options & AR_SS))
 482                         create_symtab_entry(bsdar, obj->maddr, obj->size);
 483                 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
 484                         add_to_ar_str_table(bsdar, obj->name);
 485                 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
 486         }
 487
 488         /*
 489          * Pad the symbol name string table. It is treated specially because
 490          * symbol name table should be padded by a '\0', not the common '\n'
 491          * for other members. The size of sn table includes the pad bit.
 492          */
 493         if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
 494                 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 495
 496         /*
 497          * Archive string table is padded by a "\n" as the normal members.
 498          * The differece is that the size of archive string table counts
 499          * in the pad bit, while normal members' size fileds do not.
 500          */
 501         if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
 502                 bsdar->as[bsdar->as_sz++] = '\n';
 503
 504         /*
 505          * If there is a symbol table, calculate the size of pseudo members,
 506          * covert previously stored relative offsets to absolute ones, and
 507          * then make them Big Endian.
 508          *
 509          * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
 510          */
 511
 512         if (bsdar->s_cnt != 0) {
 513                 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
 514                 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
 515                 if (bsdar->as != NULL)
 516                         pm_sz += _ARHDR_LEN + bsdar->as_sz;
 517                 for (i = 0; (size_t)i < bsdar->s_cnt; i++)
 518                         *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
 519                             pm_sz);
 520         }
 521
 522         if ((a = archive_write_new()) == NULL)
 523                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
 524
 525         archive_write_set_format_ar_svr4(a);
 526
 527         /* The compression mode of the existing archive is used
 528          * for the result archive or if creating a new archive, we
 529          * do not compress archive by default. This default behavior can
 530          * be overrided by compression mode specified explicitly
 531          * through command line option `-j' or `-z'.
 532          */
 533         if (bsdar->options & AR_J)
 534                 bsdar->compression = ARCHIVE_COMPRESSION_BZIP2;
 535         if (bsdar->options & AR_Z)
 536                 bsdar->compression = ARCHIVE_COMPRESSION_GZIP;
 537         if (bsdar->compression == ARCHIVE_COMPRESSION_BZIP2)
 538                 archive_write_set_compression_bzip2(a);
 539         else if (bsdar->compression == ARCHIVE_COMPRESSION_GZIP)
 540                 archive_write_set_compression_gzip(a);
 541         else
 542                 archive_write_set_compression_none(a);
 543
 544         AC(archive_write_open_filename(a, bsdar->filename));
 545
 546         /*
 547          * write the archive symbol table, if there is one.
 548          * If options -s is explicitly specified or we are invoked
 549          * as ranlib, write the symbol table even if it is empty.
 550          */
 551         if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
 552             bsdar->options & AR_S) {
 553                 entry = archive_entry_new();
 554                 archive_entry_copy_pathname(entry, "/");
 555                 archive_entry_set_mtime(entry, time(NULL), 0);
 556                 archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
 557                     sizeof(uint32_t) + bsdar->s_sn_sz);
 558                 AC(archive_write_header(a, entry));
 559                 nr = htobe32(bsdar->s_cnt);
 560                 write_data(bsdar, a, &nr, sizeof(uint32_t));
 561                 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
 562                     bsdar->s_cnt);
 563                 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
 564                 archive_entry_free(entry);
 565         }
 566
 567         /* write the archive string table, if any. */
 568         if (bsdar->as != NULL) {
 569                 entry = archive_entry_new();
 570                 archive_entry_copy_pathname(entry, "//");
 571                 archive_entry_set_size(entry, bsdar->as_sz);
 572                 AC(archive_write_header(a, entry));
 573                 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
 574                 archive_entry_free(entry);
 575         }
 576
 577         /* write normal members. */
 578         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 579                 entry = archive_entry_new();
 580                 archive_entry_copy_pathname(entry, obj->name);
 581                 archive_entry_set_uid(entry, obj->uid);
 582                 archive_entry_set_gid(entry, obj->gid);
 583                 archive_entry_set_mode(entry, obj->md);
 584                 archive_entry_set_size(entry, obj->size);
 585                 archive_entry_set_mtime(entry, obj->mtime, 0);
 586                 archive_entry_set_dev(entry, obj->dev);
 587                 archive_entry_set_ino(entry, obj->ino);
 588                 archive_entry_set_filetype(entry, AE_IFREG);
 589                 AC(archive_write_header(a, entry));
 590                 write_data(bsdar, a, obj->maddr, obj->size);
 591                 archive_entry_free(entry);
 592         }
 593
 594         AC(archive_write_close(a));
 595         AC(archive_write_finish(a));
 596 }
 597
 598 /*
 599  * Extract global symbols from ELF binary members.
 600  */
 601 static void
 602 create_symtab_entry(struct bsdar *bsdar, void *maddr, size_t size)
 603 {
 604         Elf             *e;
 605         Elf_Scn         *scn;
 606         GElf_Shdr        shdr;
 607         GElf_Sym         sym;
 608         Elf_Data        *data;
 609         char            *name;
 610         size_t           n, shstrndx;
 611         int              elferr, tabndx, len, i;
 612
 613         if ((e = elf_memory(maddr, size)) == NULL) {
 614                 bsdar_warnc(bsdar, 0, "elf_memory() failed: %s",
 615                      elf_errmsg(-1));
 616                 return;
 617         }
 618         if (elf_kind(e) != ELF_K_ELF) {
 619                 /* Sliently ignore non-elf member. */
 620                 elf_end(e);
 621                 return;
 622         }
 623         if (elf_getshstrndx(e, &shstrndx) == 0) {
 624                 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_getshstrndx failed: %s",
 625                      elf_errmsg(-1));
 626                 elf_end(e);
 627                 return;
 628         }
 629
 630         tabndx = -1;
 631         scn = NULL;
 632         while ((scn = elf_nextscn(e, scn)) != NULL) {
 633                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 634                         bsdar_warnc(bsdar, 0,
 635                             "elf_getshdr failed: %s", elf_errmsg(-1));
 636                         continue;
 637                 }
 638                 if ((name = elf_strptr(e, shstrndx, shdr.sh_name)) == NULL) {
 639                         bsdar_warnc(bsdar, 0,
 640                             "elf_strptr failed: %s", elf_errmsg(-1));
 641                         continue;
 642                 }
 643                 if (strcmp(name, ".strtab") == 0) {
 644                         tabndx = elf_ndxscn(scn);
 645                         break;
 646                 }
 647         }
 648         elferr = elf_errno();
 649         if (elferr != 0)
 650                 bsdar_warnc(bsdar, 0, "elf_nextscn failed: %s",
 651                      elf_errmsg(elferr));
 652         if (tabndx == -1) {
 653                 bsdar_warnc(bsdar, 0, "can't find .strtab section");
 654                 elf_end(e);
 655                 return;
 656         }
 657
 658         scn = NULL;
 659         while ((scn = elf_nextscn(e, scn)) != NULL) {
 660                 if (gelf_getshdr(scn, &shdr) != &shdr) {
 661                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 662                             "elf_getshdr failed: %s", elf_errmsg(-1));
 663                         continue;
 664                 }
 665                 if (shdr.sh_type != SHT_SYMTAB)
 666                         continue;
 667
 668                 data = NULL;
 669                 n = 0;
 670                 while (n < shdr.sh_size &&
 671                     (data = elf_getdata(scn, data)) != NULL) {
 672                         len = data->d_size / shdr.sh_entsize;
 673                         for (i = 0; i < len; i++) {
 674                                 if (gelf_getsym(data, i, &sym) != &sym) {
 675                                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 676                                             "gelf_getsym failed: %s",
 677                                              elf_errmsg(-1));
 678                                         continue;
 679                                 }
 680
 681                                 /* keep only global or weak symbols */
 682                                 if (GELF_ST_BIND(sym.st_info) != STB_GLOBAL &&
 683                                     GELF_ST_BIND(sym.st_info) != STB_WEAK)
 684                                         continue;
 685
 686                                 /* keep only defined symbols */
 687                                 if (sym.st_shndx == SHN_UNDEF)
 688                                         continue;
 689
 690                                 if ((name = elf_strptr(e, tabndx,
 691                                     sym.st_name)) == NULL) {
 692                                         bsdar_warnc(bsdar, EX_SOFTWARE, 0,
 693                                             "elf_strptr failed: %s",
 694                                              elf_errmsg(-1));
 695                                         continue;
 696                                 }
 697
 698                                 add_to_ar_sym_table(bsdar, name);
 699                         }
 700                 }
 701         }
 702         elferr = elf_errno();
 703         if (elferr != 0)
 704                 bsdar_warnc(bsdar, EX_SOFTWARE, 0, "elf_nextscn failed: %s",
 705                      elf_errmsg(elferr));
 706
 707         elf_end(e);
 708 }
 709
 710 /*
 711  * Append to the archive string table buffer.
 712  */
 713 static void
 714 add_to_ar_str_table(struct bsdar *bsdar, const char *name)
 715 {
 716
 717         if (bsdar->as == NULL) {
 718                 bsdar->as_cap = _INIT_AS_CAP;
 719                 bsdar->as_sz = 0;
 720                 if ((bsdar->as = malloc(bsdar->as_cap)) == NULL)
 721                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 722         }
 723
 724         /*
 725          * The space required for holding one member name in as table includes:
 726          * strlen(name) + (1 for '/') + (1 for '\n') + (possibly 1 for padding).
 727          */
 728         if (bsdar->as_sz + strlen(name) + 3 > bsdar->as_cap) {
 729                 bsdar->as_cap *= 2;
 730                 bsdar->as = realloc(bsdar->as, bsdar->as_cap);
 731                 if (bsdar->as == NULL)
 732                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 733         }
 734         strncpy(&bsdar->as[bsdar->as_sz], name, strlen(name));
 735         bsdar->as_sz += strlen(name);
 736         bsdar->as[bsdar->as_sz++] = '/';
 737         bsdar->as[bsdar->as_sz++] = '\n';
 738 }
 739
 740 /*
 741  * Append to the archive symbol table buffer.
 742  */
 743 static void
 744 add_to_ar_sym_table(struct bsdar *bsdar, const char *name)
 745 {
 746
 747         if (bsdar->s_so == NULL) {
 748                 if ((bsdar->s_so = malloc(_INIT_SYMOFF_CAP)) ==
 749                     NULL)
 750                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 751                 bsdar->s_so_cap = _INIT_SYMOFF_CAP;
 752                 bsdar->s_cnt = 0;
 753         }
 754
 755         if (bsdar->s_sn == NULL) {
 756                 if ((bsdar->s_sn = malloc(_INIT_SYMNAME_CAP)) == NULL)
 757                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 758                 bsdar->s_sn_cap = _INIT_SYMNAME_CAP;
 759                 bsdar->s_sn_sz = 0;
 760         }
 761
 762         if (bsdar->s_cnt * sizeof(uint32_t) >= bsdar->s_so_cap) {
 763                 bsdar->s_so_cap *= 2;
 764                 bsdar->s_so = realloc(bsdar->s_so, bsdar->s_so_cap);
 765                 if (bsdar->s_so == NULL)
 766                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 767         }
 768         bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
 769         bsdar->s_cnt++;
 770
 771         /*
 772          * The space required for holding one symbol name in sn table includes:
 773          * strlen(name) + (1 for '\n') + (possibly 1 for padding).
 774          */
 775         if (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
 776                 bsdar->s_sn_cap *= 2;
 777                 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
 778                 if (bsdar->s_sn == NULL)
 779                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 780         }
 781         strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
 782         bsdar->s_sn_sz += strlen(name);
 783         bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 784 }