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 #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(uint32_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_archive(struct bsdar *bsdar, char mode);
  69 static void     write_cleanup(struct bsdar *bsdar);
  70 static void     write_data(struct bsdar *bsdar, struct archive *a,
  71                     const void *buf, size_t s);
  72 static void     write_objs(struct bsdar *bsdar);
  73
  74 void
  75 ar_mode_d(struct bsdar *bsdar)
  76 {
  77
  78         write_archive(bsdar, 'd');
  79 }
  80
  81 void
  82 ar_mode_m(struct bsdar *bsdar)
  83 {
  84
  85         write_archive(bsdar, 'm');
  86 }
  87
  88 void
  89 ar_mode_q(struct bsdar *bsdar)
  90 {
  91
  92         write_archive(bsdar, 'q');
  93 }
  94
  95 void
  96 ar_mode_r(struct bsdar *bsdar)
  97 {
  98
  99         write_archive(bsdar, 'r');
 100 }
 101
 102 void
 103 ar_mode_s(struct bsdar *bsdar)
 104 {
 105
 106         write_archive(bsdar, 's');
 107 }
 108
 109 void
 110 ar_mode_A(struct bsdar *bsdar)
 111 {
 112
 113         write_archive(bsdar, 'A');
 114 }
 115
 116 /*
 117  * Create object from file, return created obj upon success, or NULL
 118  * when an error occurs or the member is not newer than existing
 119  * one while -u is specified.
 120  */
 121 static struct ar_obj *
 122 create_obj_from_file(struct bsdar *bsdar, const char *name, time_t mtime)
 123 {
 124         struct ar_obj           *obj;
 125         struct stat              sb;
 126         const char              *bname;
 127         char                    *tmpname;
 128
 129         if (name == NULL)
 130                 return (NULL);
 131
 132         obj = malloc(sizeof(struct ar_obj));
 133         if (obj == NULL)
 134                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 135         if ((obj->fd = open(name, O_RDONLY, 0)) < 0) {
 136                 bsdar_warnc(bsdar, errno, "can't open file: %s", name);
 137                 free(obj);
 138                 return (NULL);
 139         }
 140
 141         tmpname = strdup(name);
 142         if (tmpname == NULL)
 143                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
 144         if ((bname = basename(tmpname)) == NULL)
 145                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "basename failed");
 146         if (bsdar->options & AR_TR && strlen(bname) > _TRUNCATE_LEN) {
 147                 if ((obj->name = malloc(_TRUNCATE_LEN + 1)) == NULL)
 148                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 149                 (void)strncpy(obj->name, bname, _TRUNCATE_LEN);
 150                 obj->name[_TRUNCATE_LEN] = '\0';
 151         } else
 152                 if ((obj->name = strdup(bname)) == NULL)
 153                     bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
 154         free(tmpname);
 155
 156         if (fstat(obj->fd, &sb) < 0) {
 157                 bsdar_warnc(bsdar, errno, "can't fstat file: %s", obj->name);
 158                 goto giveup;
 159         }
 160         if (!S_ISREG(sb.st_mode)) {
 161                 bsdar_warnc(bsdar, 0, "%s is not an ordinary file", obj->name);
 162                 goto giveup;
 163         }
 164
 165         /*
 166          * When option '-u' is specified and member is not newer than the
 167          * existing one, the replace will not happen. While if mtime == 0,
 168          * which indicates that this is to "replace a none exist member",
 169          * the replace will proceed regardless of '-u'.
 170          */
 171         if (mtime != 0 && bsdar->options & AR_U && sb.st_mtime <= mtime)
 172                 goto giveup;
 173
 174         /*
 175          * When option '-D' is specified, mtime and UID / GID from the file
 176          * will be replaced with 0, and file mode with 644. This ensures that
 177          * checksums will match for two archives containing the exact same
 178          * files.
 179          */
 180         if (bsdar->options & AR_D) {
 181                 obj->uid = 0;
 182                 obj->gid = 0;
 183                 obj->mtime = 0;
 184                 obj->md = S_IFREG | 0644;
 185         } else {
 186                 obj->uid = sb.st_uid;
 187                 obj->gid = sb.st_gid;
 188                 obj->mtime = sb.st_mtime;
 189                 obj->md = sb.st_mode;
 190         }
 191         obj->size = sb.st_size;
 192         obj->dev = sb.st_dev;
 193         obj->ino = sb.st_ino;
 194
 195         if (obj->size == 0) {
 196                 obj->maddr = NULL;
 197                 return (obj);
 198         }
 199
 200         if ((obj->maddr = mmap(NULL, obj->size, PROT_READ,
 201             MAP_PRIVATE, obj->fd, (off_t)0)) == MAP_FAILED) {
 202                 bsdar_warnc(bsdar, errno, "can't mmap file: %s", obj->name);
 203                 goto giveup;
 204         }
 205         if (close(obj->fd) < 0)
 206                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
 207                     obj->name);
 208
 209         return (obj);
 210
 211 giveup:
 212         if (close(obj->fd) < 0)
 213                 bsdar_errc(bsdar, EX_SOFTWARE, errno, "close failed: %s",
 214                     obj->name);
 215         free(obj->name);
 216         free(obj);
 217         return (NULL);
 218 }
 219
 220 /*
 221  * Free object itself and its associated allocations.
 222  */
 223 static void
 224 free_obj(struct bsdar *bsdar, struct ar_obj *obj)
 225 {
 226         if (obj->fd == -1)
 227                 free(obj->maddr);
 228         else
 229                 if (obj->maddr != NULL && munmap(obj->maddr, obj->size))
 230                         bsdar_warnc(bsdar, errno,
 231                             "can't munmap file: %s", obj->name);
 232         free(obj->name);
 233         free(obj);
 234 }
 235
 236 /*
 237  * Insert obj to the tail, or before/after the pos obj.
 238  */
 239 static void
 240 insert_obj(struct bsdar *bsdar, struct ar_obj *obj, struct ar_obj *pos)
 241 {
 242         if (obj == NULL)
 243                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "try to insert a null obj");
 244
 245         if (pos == NULL || obj == pos)
 246                 /*
 247                  * If the object to move happens to be the position obj,
 248                  * or if there is not a pos obj, move it to tail.
 249                  */
 250                 goto tail;
 251
 252         if (bsdar->options & AR_B) {
 253                 TAILQ_INSERT_BEFORE(pos, obj, objs);
 254                 return;
 255         }
 256         if (bsdar->options & AR_A) {
 257                 TAILQ_INSERT_AFTER(&bsdar->v_obj, pos, obj, objs);
 258                 return;
 259         }
 260
 261 tail:
 262         TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 263
 264 }
 265
 266 /*
 267  * Read objects from archive into v_obj list. Note that checkargv is
 268  * set when read_objs is used to read objects from the target of
 269  * ADDLIB command (ar script mode), in this case argv array possibly
 270  * specifies the members ADDLIB want.
 271  */
 272 static void
 273 read_objs(struct bsdar *bsdar, const char *archive, int checkargv)
 274 {
 275         struct archive           *a;
 276         struct archive_entry     *entry;
 277         struct ar_obj            *obj;
 278         const char               *name;
 279         const char               *bname;
 280         char                     *buff;
 281         char                    **av;
 282         size_t                    size;
 283         int                       i, r, find;
 284
 285         if ((a = archive_read_new()) == NULL)
 286                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_read_new failed");
 287         archive_read_support_format_ar(a);
 288         AC(archive_read_open_filename(a, archive, DEF_BLKSZ));
 289         for (;;) {
 290                 r = archive_read_next_header(a, &entry);
 291                 if (r == ARCHIVE_FATAL)
 292                         bsdar_errc(bsdar, EX_DATAERR, 0, "%s",
 293                             archive_error_string(a));
 294                 if (r == ARCHIVE_EOF)
 295                         break;
 296                 if (r == ARCHIVE_WARN || r == ARCHIVE_RETRY)
 297                         bsdar_warnc(bsdar, 0, "%s", archive_error_string(a));
 298                 if (r == ARCHIVE_RETRY) {
 299                         bsdar_warnc(bsdar, 0, "Retrying...");
 300                         continue;
 301                 }
 302
 303                 name = archive_entry_pathname(entry);
 304
 305                 /*
 306                  * skip pseudo members.
 307                  */
 308                 if (strcmp(name, "/") == 0 || strcmp(name, "//") == 0)
 309                         continue;
 310
 311                 /*
 312                  * If checkargv is set, only read those members specified
 313                  * in argv.
 314                  */
 315                 if (checkargv && bsdar->argc > 0) {
 316                         find = 0;
 317                         for(i = 0; i < bsdar->argc; i++) {
 318                                 av = &bsdar->argv[i];
 319                                 if (*av == NULL)
 320                                         continue;
 321                                 if ((bname = basename(*av)) == NULL)
 322                                         bsdar_errc(bsdar, EX_SOFTWARE, errno,
 323                                             "basename failed");
 324                                 if (strcmp(bname, name) != 0)
 325                                         continue;
 326
 327                                 *av = NULL;
 328                                 find = 1;
 329                                 break;
 330                         }
 331                         if (!find)
 332                                 continue;
 333                 }
 334
 335                 size = archive_entry_size(entry);
 336
 337                 if (size > 0) {
 338                         if ((buff = malloc(size)) == NULL)
 339                                 bsdar_errc(bsdar, EX_SOFTWARE, errno,
 340                                     "malloc failed");
 341                         if (archive_read_data(a, buff, size) != (ssize_t)size) {
 342                                 bsdar_warnc(bsdar, 0, "%s",
 343                                     archive_error_string(a));
 344                                 free(buff);
 345                                 continue;
 346                         }
 347                 } else
 348                         buff = NULL;
 349
 350                 obj = malloc(sizeof(struct ar_obj));
 351                 if (obj == NULL)
 352                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "malloc failed");
 353                 obj->maddr = buff;
 354                 if ((obj->name = strdup(name)) == NULL)
 355                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "strdup failed");
 356                 obj->size = size;
 357                 obj->uid = archive_entry_uid(entry);
 358                 obj->gid = archive_entry_gid(entry);
 359                 obj->md = archive_entry_mode(entry);
 360                 obj->mtime = archive_entry_mtime(entry);
 361                 obj->dev = 0;
 362                 obj->ino = 0;
 363
 364                 /*
 365                  * Objects from archive have obj->fd set to -1,
 366                  * for the ease of cleaning up.
 367                  */
 368                 obj->fd = -1;
 369                 TAILQ_INSERT_TAIL(&bsdar->v_obj, obj, objs);
 370         }
 371         AC(archive_read_close(a));
 372         AC(archive_read_free(a));
 373 }
 374
 375 /*
 376  * Determine the constitution of resulting archive.
 377  */
 378 static void
 379 write_archive(struct bsdar *bsdar, char mode)
 380 {
 381         struct ar_obj            *nobj, *obj, *obj_temp, *pos;
 382         struct stat               sb;
 383         const char               *bname;
 384         char                    **av;
 385         int                       i;
 386
 387         TAILQ_INIT(&bsdar->v_obj);
 388         nobj = NULL;
 389         pos = NULL;
 390         memset(&sb, 0, sizeof(sb));
 391
 392         /*
 393          * Test if the specified archive exists, to figure out
 394          * whether we are creating one here.
 395          */
 396         if (stat(bsdar->filename, &sb) != 0) {
 397                 if (errno != ENOENT) {
 398                         bsdar_warnc(bsdar, 0, "stat %s failed",
 399                             bsdar->filename);
 400                         return;
 401                 }
 402
 403                 /* We do not create archive in mode 'd', 'm' and 's'.  */
 404                 if (mode != 'r' && mode != 'q') {
 405                         bsdar_warnc(bsdar, 0, "%s: no such file",
 406                             bsdar->filename);
 407                         return;
 408                 }
 409
 410                 /* Issue a warning if -c is not specified when creating. */
 411                 if (!(bsdar->options & AR_C))
 412                         bsdar_warnc(bsdar, 0, "creating %s", bsdar->filename);
 413                 goto new_archive;
 414         }
 415
 416         /*
 417          * First read members from existing archive.
 418          */
 419         read_objs(bsdar, bsdar->filename, 0);
 420
 421         /*
 422          * For mode 's', no member will be moved, deleted or replaced.
 423          */
 424         if (mode == 's')
 425                 goto write_objs;
 426
 427         /*
 428          * For mode 'q', we don't need to adjust existing members either.
 429          * Also, -a, -b and -i are ignored in this mode. New members are
 430          * always inserted at tail.
 431          */
 432         if (mode == 'q')
 433                 goto new_archive;
 434
 435         /*
 436          * Mode 'A' adds the contents of another archive to the tail of
 437          * current archive. Note that mode 'A' is a special mode for the
 438          * ADDLIB command of the ar script mode. Currently there is no
 439          * access to this function from the ar command line mode.
 440          */
 441         if (mode == 'A') {
 442                 /*
 443                  * Read objects from the target archive of ADDLIB command.
 444                  * If there are members specified in argv, read those members
 445                  * only, otherwise the entire archive will be read.
 446                  */
 447                 read_objs(bsdar, bsdar->addlib, 1);
 448                 goto write_objs;
 449         }
 450
 451         /*
 452          * Try to find the position member specified by user.
 453          */
 454         if (bsdar->options & AR_A || bsdar->options & AR_B) {
 455                 TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 456                         if (strcmp(obj->name, bsdar->posarg) == 0) {
 457                                 pos = obj;
 458                                 break;
 459                         }
 460                 }
 461
 462                 /*
 463                  * If can't find `pos' specified by user,
 464                  * silently insert objects at tail.
 465                  */
 466                 if (pos == NULL)
 467                         bsdar->options &= ~(AR_A | AR_B);
 468         }
 469
 470         for (i = 0; i < bsdar->argc; i++) {
 471                 av = &bsdar->argv[i];
 472
 473                 TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 474                         if ((bname = basename(*av)) == NULL)
 475                                 bsdar_errc(bsdar, EX_SOFTWARE, errno,
 476                                     "basename failed");
 477                         if (bsdar->options & AR_TR) {
 478                                 if (strncmp(bname, obj->name, _TRUNCATE_LEN))
 479                                         continue;
 480                         } else
 481                                 if (strcmp(bname, obj->name) != 0)
 482                                         continue;
 483
 484                         if (mode == 'r') {
 485                                 /*
 486                                  * if the new member is not qualified
 487                                  * to replace the old one, skip it.
 488                                  */
 489                                 nobj = create_obj_from_file(bsdar, *av,
 490                                     obj->mtime);
 491                                 if (nobj == NULL)
 492                                         goto skip_obj;
 493                         }
 494
 495                         if (bsdar->options & AR_V)
 496                                 (void)fprintf(stdout, "%c - %s\n", mode,
 497                                     *av);
 498
 499                         TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 500                         if (mode == 'd' || mode == 'r')
 501                                 free_obj(bsdar, obj);
 502
 503                         if (mode == 'm')
 504                                 insert_obj(bsdar, obj, pos);
 505                         if (mode == 'r')
 506                                 insert_obj(bsdar, nobj, pos);
 507
 508                 skip_obj:
 509                         *av = NULL;
 510                         break;
 511                 }
 512
 513         }
 514
 515 new_archive:
 516         /*
 517          * When operating in mode 'r', directly add those user specified
 518          * objects which do not exist in current archive. When operating
 519          * in mode 'q', all objects specified in command line args are
 520          * appended to the archive, without comparing with existing ones.
 521          */
 522         for (i = 0; i < bsdar->argc; i++) {
 523                 av = &bsdar->argv[i];
 524                 if (*av != NULL && (mode == 'r' || mode == 'q')) {
 525                         nobj = create_obj_from_file(bsdar, *av, 0);
 526                         if (nobj != NULL)
 527                                 insert_obj(bsdar, nobj, pos);
 528                         if (bsdar->options & AR_V && nobj != NULL)
 529                                 (void)fprintf(stdout, "a - %s\n", *av);
 530                         *av = NULL;
 531                 }
 532         }
 533
 534 write_objs:
 535         write_objs(bsdar);
 536         write_cleanup(bsdar);
 537 }
 538
 539 /*
 540  * Memory cleaning up.
 541  */
 542 static void
 543 write_cleanup(struct bsdar *bsdar)
 544 {
 545         struct ar_obj           *obj, *obj_temp;
 546
 547         TAILQ_FOREACH_SAFE(obj, &bsdar->v_obj, objs, obj_temp) {
 548                 TAILQ_REMOVE(&bsdar->v_obj, obj, objs);
 549                 free_obj(bsdar, obj);
 550         }
 551
 552         free(bsdar->as);
 553         free(bsdar->s_so);
 554         free(bsdar->s_sn);
 555         bsdar->as = NULL;
 556         bsdar->s_so = NULL;
 557         bsdar->s_sn = NULL;
 558 }
 559
 560 /*
 561  * Fault in the buffer prior to writing as a workaround for poor performance
 562  * due to interaction with kernel fs deadlock avoidance code. See the comment
 563  * above vn_io_fault_doio() in sys/kern/vfs_vnops.c for details of the issue.
 564  */
 565 static void
 566 prefault_buffer(const char *buf, size_t s)
 567 {
 568         volatile const char *p;
 569         size_t page_size;
 570
 571         if (s == 0)
 572                 return;
 573         page_size = sysconf(_SC_PAGESIZE);
 574         for (p = buf; p < buf + s; p += page_size)
 575                 *p;
 576         /*
 577          * Ensure we touch the last page as well, in case the buffer is not
 578          * page-aligned.
 579          */
 580         *(volatile const char *)(buf + s - 1);
 581 }
 582
 583 /*
 584  * Wrapper for archive_write_data().
 585  */
 586 static void
 587 write_data(struct bsdar *bsdar, struct archive *a, const void *buf, size_t s)
 588 {
 589         prefault_buffer(buf, s);
 590         if (archive_write_data(a, buf, s) != (ssize_t)s)
 591                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "%s",
 592                     archive_error_string(a));
 593 }
 594
 595 /*
 596  * Write the resulting archive members.
 597  */
 598 static void
 599 write_objs(struct bsdar *bsdar)
 600 {
 601         struct ar_obj           *obj;
 602         struct archive          *a;
 603         struct archive_entry    *entry;
 604         size_t s_sz;            /* size of archive symbol table. */
 605         size_t pm_sz;           /* size of pseudo members */
 606         int                      i, nr;
 607
 608         if (elf_version(EV_CURRENT) == EV_NONE)
 609                 bsdar_errc(bsdar, EX_SOFTWARE, 0,
 610                     "ELF library initialization failed: %s", elf_errmsg(-1));
 611
 612         bsdar->rela_off = 0;
 613
 614         /* Create archive symbol table and archive string table, if need. */
 615         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 616                 if (!(bsdar->options & AR_SS) && obj->maddr != NULL)
 617                         create_symtab_entry(bsdar, obj->maddr, obj->size);
 618                 if (strlen(obj->name) > _MAXNAMELEN_SVR4)
 619                         add_to_ar_str_table(bsdar, obj->name);
 620                 bsdar->rela_off += _ARHDR_LEN + obj->size + obj->size % 2;
 621         }
 622
 623         /*
 624          * Pad the symbol name string table. It is treated specially because
 625          * symbol name table should be padded by a '\0', not the common '\n'
 626          * for other members. The size of sn table includes the pad bit.
 627          */
 628         if (bsdar->s_cnt != 0 && bsdar->s_sn_sz % 2 != 0)
 629                 bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 630
 631         /*
 632          * Archive string table is padded by a "\n" as the normal members.
 633          * The difference is that the size of archive string table counts
 634          * in the pad bit, while normal members' size fileds do not.
 635          */
 636         if (bsdar->as != NULL && bsdar->as_sz % 2 != 0)
 637                 bsdar->as[bsdar->as_sz++] = '\n';
 638
 639         /*
 640          * If there is a symbol table, calculate the size of pseudo members,
 641          * convert previously stored relative offsets to absolute ones, and
 642          * then make them Big Endian.
 643          *
 644          * absolute_offset = htobe32(relative_offset + size_of_pseudo_members)
 645          */
 646
 647         if (bsdar->s_cnt != 0) {
 648                 s_sz = (bsdar->s_cnt + 1) * sizeof(uint32_t) + bsdar->s_sn_sz;
 649                 pm_sz = _ARMAG_LEN + (_ARHDR_LEN + s_sz);
 650                 if (bsdar->as != NULL)
 651                         pm_sz += _ARHDR_LEN + bsdar->as_sz;
 652                 for (i = 0; (size_t)i < bsdar->s_cnt; i++)
 653                         *(bsdar->s_so + i) = htobe32(*(bsdar->s_so + i) +
 654                             pm_sz);
 655         }
 656
 657         if ((a = archive_write_new()) == NULL)
 658                 bsdar_errc(bsdar, EX_SOFTWARE, 0, "archive_write_new failed");
 659
 660         archive_write_set_format_ar_svr4(a);
 661
 662         AC(archive_write_open_filename(a, bsdar->filename));
 663
 664         /*
 665          * write the archive symbol table, if there is one.
 666          * If options -s is explicitly specified or we are invoked
 667          * as ranlib, write the symbol table even if it is empty.
 668          */
 669         if ((bsdar->s_cnt != 0 && !(bsdar->options & AR_SS)) ||
 670             bsdar->options & AR_S) {
 671                 entry = archive_entry_new();
 672                 if (entry == NULL)
 673                         bsdar_errc(bsdar, EX_SOFTWARE, 0,
 674                             "archive_entry_new failed");
 675                 archive_entry_copy_pathname(entry, "/");
 676                 if ((bsdar->options & AR_D) == 0)
 677                         archive_entry_set_mtime(entry, time(NULL), 0);
 678                 archive_entry_set_size(entry, (bsdar->s_cnt + 1) *
 679                     sizeof(uint32_t) + bsdar->s_sn_sz);
 680                 AC(archive_write_header(a, entry));
 681                 nr = htobe32(bsdar->s_cnt);
 682                 write_data(bsdar, a, &nr, sizeof(uint32_t));
 683                 write_data(bsdar, a, bsdar->s_so, sizeof(uint32_t) *
 684                     bsdar->s_cnt);
 685                 write_data(bsdar, a, bsdar->s_sn, bsdar->s_sn_sz);
 686                 archive_entry_free(entry);
 687         }
 688
 689         /* write the archive string table, if any. */
 690         if (bsdar->as != NULL) {
 691                 entry = archive_entry_new();
 692                 if (entry == NULL)
 693                         bsdar_errc(bsdar, EX_SOFTWARE, 0,
 694                             "archive_entry_new failed");
 695                 archive_entry_copy_pathname(entry, "//");
 696                 archive_entry_set_size(entry, bsdar->as_sz);
 697                 AC(archive_write_header(a, entry));
 698                 write_data(bsdar, a, bsdar->as, bsdar->as_sz);
 699                 archive_entry_free(entry);
 700         }
 701
 702         /* write normal members. */
 703         TAILQ_FOREACH(obj, &bsdar->v_obj, objs) {
 704                 entry = archive_entry_new();
 705                 if (entry == NULL)
 706                         bsdar_errc(bsdar, EX_SOFTWARE, 0,
 707                             "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, EX_SOFTWARE, 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, EX_SOFTWARE, 0,
 790                             "elf_getshdr failed: %s", 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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, EX_SOFTWARE, 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(uint32_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, EX_SOFTWARE, errno, "realloc failed");
 895         }
 896         bsdar->s_so[bsdar->s_cnt] = bsdar->rela_off;
 897         bsdar->s_cnt++;
 898
 899         /*
 900          * The space required for holding one symbol name in sn table includes:
 901          * strlen(name) + (1 for '\n') + (possibly 1 for padding).
 902          */
 903         while (bsdar->s_sn_sz + strlen(name) + 2 > bsdar->s_sn_cap) {
 904                 bsdar->s_sn_cap *= 2;
 905                 bsdar->s_sn = realloc(bsdar->s_sn, bsdar->s_sn_cap);
 906                 if (bsdar->s_sn == NULL)
 907                         bsdar_errc(bsdar, EX_SOFTWARE, errno, "realloc failed");
 908         }
 909         strncpy(&bsdar->s_sn[bsdar->s_sn_sz], name, strlen(name));
 910         bsdar->s_sn_sz += strlen(name);
 911         bsdar->s_sn[bsdar->s_sn_sz++] = '\0';
 912 }