contrib/libarchive-2.0/tar/bsdtar.c

   1 /*-
   2  * Copyright (c) 2003-2007 Tim Kientzle
   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  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  17  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "bsdtar_platform.h"
  27 __FBSDID("$FreeBSD: src/usr.bin/tar/bsdtar.c,v 1.73 2007/03/11 10:36:42 kientzle Exp $");
  28
  29 #ifdef HAVE_SYS_PARAM_H
  30 #include <sys/param.h>
  31 #endif
  32 #ifdef HAVE_SYS_STAT_H
  33 #include <sys/stat.h>
  34 #endif
  35 #ifdef HAVE_ERRNO_H
  36 #include <errno.h>
  37 #endif
  38 #ifdef HAVE_FCNTL_H
  39 #include <fcntl.h>
  40 #endif
  41 #ifdef HAVE_GETOPT_LONG
  42 #include <getopt.h>
  43 #else
  44 struct option {
  45         const char *name;
  46         int has_arg;
  47         int *flag;
  48         int val;
  49 };
  50 #define no_argument 0
  51 #define required_argument 1
  52 #endif
  53 #ifdef HAVE_LANGINFO_H
  54 #include <langinfo.h>
  55 #endif
  56 #ifdef HAVE_LOCALE_H
  57 #include <locale.h>
  58 #endif
  59 #ifdef HAVE_PATHS_H
  60 #include <paths.h>
  61 #endif
  62 #include <stdio.h>
  63 #ifdef HAVE_STDLIB_H
  64 #include <stdlib.h>
  65 #endif
  66 #ifdef HAVE_STRING_H
  67 #include <string.h>
  68 #endif
  69 #ifdef HAVE_TIME_H
  70 #include <time.h>
  71 #endif
  72 #ifdef HAVE_UNISTD_H
  73 #include <unistd.h>
  74 #endif
  75 #if HAVE_ZLIB_H
  76 #include <zlib.h>
  77 #endif
  78
  79 #include "bsdtar.h"
  80
  81 /*
  82  * Per POSIX.1-1988, tar defaults to reading/writing archives to/from
  83  * the default tape device for the system.  Pick something reasonable here.
  84  */
  85 #ifdef __linux
  86 #define _PATH_DEFTAPE "/dev/st0"
  87 #endif
  88
  89 #ifndef _PATH_DEFTAPE
  90 #define _PATH_DEFTAPE "/dev/tape"
  91 #endif
  92
  93 /* External function to parse a date/time string (from getdate.y) */
  94 time_t get_date(const char *);
  95
  96 static int               bsdtar_getopt(struct bsdtar *, const char *optstring,
  97     const struct option **poption);
  98 static void              long_help(struct bsdtar *);
  99 static void              only_mode(struct bsdtar *, const char *opt,
 100                              const char *valid);
 101 static char **           rewrite_argv(struct bsdtar *,
 102                              int *argc, char ** src_argv,
 103                              const char *optstring);
 104 static void              set_mode(struct bsdtar *, char opt);
 105 static void              version(void);
 106
 107 /*
 108  * The leading '+' here forces the GNU version of getopt() (as well as
 109  * both the GNU and BSD versions of getopt_long) to stop at the first
 110  * non-option.  Otherwise, GNU getopt() permutes the arguments and
 111  * screws up -C processing.
 112  */
 113 static const char *tar_opts = "+Bb:C:cf:HhI:jkLlmnOoPprtT:UuvW:wX:xyZz";
 114
 115 /*
 116  * Most of these long options are deliberately not documented.  They
 117  * are provided only to make life easier for people who also use GNU tar.
 118  * The only long options documented in the manual page are the ones
 119  * with no corresponding short option, such as --exclude, --nodump,
 120  * and --fast-read.
 121  *
 122  * On systems that lack getopt_long, long options can be specified
 123  * using -W longopt and -W longopt=value, e.g. "-W nodump" is the same
 124  * as "--nodump" and "-W exclude=pattern" is the same as "--exclude
 125  * pattern".  This does not rely the GNU getopt() "W;" extension, so
 126  * should work correctly on any system with a POSIX-compliant getopt().
 127  */
 128
 129 /* Fake short equivalents for long options that otherwise lack them. */
 130 enum {
 131         OPTION_CHECK_LINKS=1,
 132         OPTION_EXCLUDE,
 133         OPTION_FAST_READ,
 134         OPTION_FORMAT,
 135         OPTION_HELP,
 136         OPTION_INCLUDE,
 137         OPTION_NEWER_CTIME,
 138         OPTION_NEWER_CTIME_THAN,
 139         OPTION_NEWER_MTIME,
 140         OPTION_NEWER_MTIME_THAN,
 141         OPTION_NODUMP,
 142         OPTION_NO_SAME_OWNER,
 143         OPTION_NO_SAME_PERMISSIONS,
 144         OPTION_NULL,
 145         OPTION_ONE_FILE_SYSTEM,
 146         OPTION_STRIP_COMPONENTS,
 147         OPTION_TOTALS,
 148         OPTION_VERSION
 149 };
 150
 151 /*
 152  * If you add anything, be very careful to keep this list properly
 153  * sorted, as the -W logic relies on it.
 154  */
 155 static const struct option tar_longopts[] = {
 156         { "absolute-paths",     no_argument,       NULL, 'P' },
 157         { "append",             no_argument,       NULL, 'r' },
 158         { "block-size",         required_argument, NULL, 'b' },
 159         { "bunzip2",            no_argument,       NULL, 'j' },
 160         { "bzip",               no_argument,       NULL, 'j' },
 161         { "bzip2",              no_argument,       NULL, 'j' },
 162         { "cd",                 required_argument, NULL, 'C' },
 163         { "check-links",        no_argument,       NULL, OPTION_CHECK_LINKS },
 164         { "confirmation",       no_argument,       NULL, 'w' },
 165         { "create",             no_argument,       NULL, 'c' },
 166         { "dereference",        no_argument,       NULL, 'L' },
 167         { "directory",          required_argument, NULL, 'C' },
 168         { "exclude",            required_argument, NULL, OPTION_EXCLUDE },
 169         { "exclude-from",       required_argument, NULL, 'X' },
 170         { "extract",            no_argument,       NULL, 'x' },
 171         { "fast-read",          no_argument,       NULL, OPTION_FAST_READ },
 172         { "file",               required_argument, NULL, 'f' },
 173         { "files-from",         required_argument, NULL, 'T' },
 174         { "format",             required_argument, NULL, OPTION_FORMAT },
 175         { "gunzip",             no_argument,       NULL, 'z' },
 176         { "gzip",               no_argument,       NULL, 'z' },
 177         { "help",               no_argument,       NULL, OPTION_HELP },
 178         { "include",            required_argument, NULL, OPTION_INCLUDE },
 179         { "interactive",        no_argument,       NULL, 'w' },
 180         { "keep-old-files",     no_argument,       NULL, 'k' },
 181         { "list",               no_argument,       NULL, 't' },
 182         { "modification-time",  no_argument,       NULL, 'm' },
 183         { "newer",              required_argument, NULL, OPTION_NEWER_CTIME },
 184         { "newer-ctime",        required_argument, NULL, OPTION_NEWER_CTIME },
 185         { "newer-ctime-than",   required_argument, NULL, OPTION_NEWER_CTIME_THAN },
 186         { "newer-mtime",        required_argument, NULL, OPTION_NEWER_MTIME },
 187         { "newer-mtime-than",   required_argument, NULL, OPTION_NEWER_MTIME_THAN },
 188         { "newer-than",         required_argument, NULL, OPTION_NEWER_CTIME_THAN },
 189         { "nodump",             no_argument,       NULL, OPTION_NODUMP },
 190         { "norecurse",          no_argument,       NULL, 'n' },
 191         { "no-recursion",       no_argument,       NULL, 'n' },
 192         { "no-same-owner",      no_argument,       NULL, OPTION_NO_SAME_OWNER },
 193         { "no-same-permissions",no_argument,       NULL, OPTION_NO_SAME_PERMISSIONS },
 194         { "null",               no_argument,       NULL, OPTION_NULL },
 195         { "one-file-system",    no_argument,       NULL, OPTION_ONE_FILE_SYSTEM },
 196         { "preserve-permissions", no_argument,     NULL, 'p' },
 197         { "read-full-blocks",   no_argument,       NULL, 'B' },
 198         { "same-permissions",   no_argument,       NULL, 'p' },
 199         { "strip-components",   required_argument, NULL, OPTION_STRIP_COMPONENTS },
 200         { "to-stdout",          no_argument,       NULL, 'O' },
 201         { "totals",             no_argument,       NULL, OPTION_TOTALS },
 202         { "unlink",             no_argument,       NULL, 'U' },
 203         { "unlink-first",       no_argument,       NULL, 'U' },
 204         { "update",             no_argument,       NULL, 'u' },
 205         { "verbose",            no_argument,       NULL, 'v' },
 206         { "version",            no_argument,       NULL, OPTION_VERSION },
 207         { NULL, 0, NULL, 0 }
 208 };
 209
 210 /* A basic set of security flags to request from libarchive. */
 211 #define SECURITY                                        \
 212         (ARCHIVE_EXTRACT_SECURE_SYMLINKS                \
 213          | ARCHIVE_EXTRACT_SECURE_NODOTDOT)
 214
 215 int
 216 main(int argc, char **argv)
 217 {
 218         struct bsdtar           *bsdtar, bsdtar_storage;
 219         const struct option     *option;
 220         int                      opt, t;
 221         char                     option_o;
 222         char                     possible_help_request;
 223         char                     buff[16];
 224
 225         /*
 226          * Use a pointer for consistency, but stack-allocated storage
 227          * for ease of cleanup.
 228          */
 229         bsdtar = &bsdtar_storage;
 230         memset(bsdtar, 0, sizeof(*bsdtar));
 231         bsdtar->fd = -1; /* Mark as "unused" */
 232         option_o = 0;
 233
 234         /* Need bsdtar->progname before calling bsdtar_warnc. */
 235         if (*argv == NULL)
 236                 bsdtar->progname = "bsdtar";
 237         else {
 238                 bsdtar->progname = strrchr(*argv, '/');
 239                 if (bsdtar->progname != NULL)
 240                         bsdtar->progname++;
 241                 else
 242                         bsdtar->progname = *argv;
 243         }
 244
 245         if (setlocale(LC_ALL, "") == NULL)
 246                 bsdtar_warnc(bsdtar, 0, "Failed to set default locale");
 247 #if defined(HAVE_NL_LANGINFO) && defined(HAVE_D_MD_ORDER)
 248         bsdtar->day_first = (*nl_langinfo(D_MD_ORDER) == 'd');
 249 #endif
 250         possible_help_request = 0;
 251
 252         /* Look up uid of current user for future reference */
 253         bsdtar->user_uid = geteuid();
 254
 255         /* Default: open tape drive. */
 256         bsdtar->filename = getenv("TAPE");
 257         if (bsdtar->filename == NULL)
 258                 bsdtar->filename = _PATH_DEFTAPE;
 259
 260         /* Default: preserve mod time on extract */
 261         bsdtar->extract_flags = ARCHIVE_EXTRACT_TIME;
 262
 263         /* Default: Perform basic security checks. */
 264         bsdtar->extract_flags |= SECURITY;
 265
 266         /* Defaults for root user: */
 267         if (bsdtar->user_uid == 0) {
 268                 /* --same-owner */
 269                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_OWNER;
 270                 /* -p */
 271                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
 272                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
 273                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_XATTR;
 274                 bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
 275         }
 276
 277         /* Rewrite traditional-style tar arguments, if used. */
 278         argv = rewrite_argv(bsdtar, &argc, argv, tar_opts);
 279
 280         bsdtar->argv = argv;
 281         bsdtar->argc = argc;
 282
 283         /* Process all remaining arguments now. */
 284         /*
 285          * Comments following each option indicate where that option
 286          * originated:  SUSv2, POSIX, GNU tar, star, etc.  If there's
 287          * no such comment, then I don't know of anyone else who
 288          * implements that option.
 289          */
 290         while ((opt = bsdtar_getopt(bsdtar, tar_opts, &option)) != -1) {
 291                 switch (opt) {
 292                 case 'B': /* GNU tar */
 293                         /* libarchive doesn't need this; just ignore it. */
 294                         break;
 295                 case 'b': /* SUSv2 */
 296                         t = atoi(optarg);
 297                         if (t <= 0 || t > 1024)
 298                                 bsdtar_errc(bsdtar, 1, 0,
 299                                     "Argument to -b is out of range (1..1024)");
 300                         bsdtar->bytes_per_block = 512 * t;
 301                         break;
 302                 case 'C': /* GNU tar */
 303                         set_chdir(bsdtar, optarg);
 304                         break;
 305                 case 'c': /* SUSv2 */
 306                         set_mode(bsdtar, opt);
 307                         break;
 308                 case OPTION_CHECK_LINKS: /* GNU tar */
 309                         bsdtar->option_warn_links = 1;
 310                         break;
 311                 case OPTION_EXCLUDE: /* GNU tar */
 312                         if (exclude(bsdtar, optarg))
 313                                 bsdtar_errc(bsdtar, 1, 0,
 314                                     "Couldn't exclude %s\n", optarg);
 315                         break;
 316                 case OPTION_FORMAT: /* GNU tar, others */
 317                         bsdtar->create_format = optarg;
 318                         break;
 319                 case 'f': /* SUSv2 */
 320                         bsdtar->filename = optarg;
 321                         if (strcmp(bsdtar->filename, "-") == 0)
 322                                 bsdtar->filename = NULL;
 323                         break;
 324                 case OPTION_FAST_READ: /* GNU tar */
 325                         bsdtar->option_fast_read = 1;
 326                         break;
 327                 case 'H': /* BSD convention */
 328                         bsdtar->symlink_mode = 'H';
 329                         break;
 330                 case 'h': /* Linux Standards Base, gtar; synonym for -L */
 331                         bsdtar->symlink_mode = 'L';
 332                         /* Hack: -h by itself is the "help" command. */
 333                         possible_help_request = 1;
 334                         break;
 335                 case OPTION_HELP: /* GNU tar, others */
 336                         long_help(bsdtar);
 337                         exit(0);
 338                         break;
 339                 case 'I': /* GNU tar */
 340                         /*
 341                          * TODO: Allow 'names' to come from an archive,
 342                          * not just a text file.  Design a good UI for
 343                          * allowing names and mode/owner to be read
 344                          * from an archive, with contents coming from
 345                          * disk.  This can be used to "refresh" an
 346                          * archive or to design archives with special
 347                          * permissions without having to create those
 348                          * permissions on disk.
 349                          */
 350                         bsdtar->names_from_file = optarg;
 351                         break;
 352                 case OPTION_INCLUDE:
 353                         /*
 354                          * Noone else has the @archive extension, so
 355                          * noone else needs this to filter entries
 356                          * when transforming archives.
 357                          */
 358                         if (include(bsdtar, optarg))
 359                                 bsdtar_errc(bsdtar, 1, 0,
 360                                     "Failed to add %s to inclusion list",
 361                                     optarg);
 362                         break;
 363                 case 'j': /* GNU tar */
 364 #if HAVE_LIBBZ2
 365                         if (bsdtar->create_compression != '\0')
 366                                 bsdtar_errc(bsdtar, 1, 0,
 367                                     "Can't specify both -%c and -%c", opt,
 368                                     bsdtar->create_compression);
 369                         bsdtar->create_compression = opt;
 370 #else
 371                         bsdtar_warnc(bsdtar, 0, "-j compression not supported by this version of bsdtar");
 372                         usage(bsdtar);
 373 #endif
 374                         break;
 375                 case 'k': /* GNU tar */
 376                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_NO_OVERWRITE;
 377                         break;
 378                 case 'L': /* BSD convention */
 379                         bsdtar->symlink_mode = 'L';
 380                         break;
 381                 case 'l': /* SUSv2 and GNU conflict badly here */
 382                         if (getenv("POSIXLY_CORRECT") != NULL) {
 383                                 /* User has asked for POSIX/SUS behavior. */
 384                                 bsdtar->option_warn_links = 1;
 385                         } else {
 386                                 fprintf(stderr,
 387 "Error: -l has different behaviors in different tar programs.\n");
 388                                 fprintf(stderr,
 389 "  For the GNU behavior, use --one-file-system instead.\n");
 390                                 fprintf(stderr,
 391 "  For the POSIX behavior, use --check-links instead.\n");
 392                                 usage(bsdtar);
 393                         }
 394                         break;
 395                 case 'm': /* SUSv2 */
 396                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_TIME;
 397                         break;
 398                 case 'n': /* GNU tar */
 399                         bsdtar->option_no_subdirs = 1;
 400                         break;
 401                 /*
 402                  * Selecting files by time:
 403                  *    --newer-?time='date' Only files newer than 'date'
 404                  *    --newer-?time-than='file' Only files newer than time
 405                  *         on specified file (useful for incremental backups)
 406                  * TODO: Add corresponding "older" options to reverse these.
 407                  */
 408                 case OPTION_NEWER_CTIME: /* GNU tar */
 409                         bsdtar->newer_ctime_sec = get_date(optarg);
 410                         break;
 411                 case OPTION_NEWER_CTIME_THAN:
 412                         {
 413                                 struct stat st;
 414                                 if (stat(optarg, &st) != 0)
 415                                         bsdtar_errc(bsdtar, 1, 0,
 416                                             "Can't open file %s", optarg);
 417                                 bsdtar->newer_ctime_sec = st.st_ctime;
 418                                 bsdtar->newer_ctime_nsec =
 419                                     ARCHIVE_STAT_CTIME_NANOS(&st);
 420                         }
 421                         break;
 422                 case OPTION_NEWER_MTIME: /* GNU tar */
 423                         bsdtar->newer_mtime_sec = get_date(optarg);
 424                         break;
 425                 case OPTION_NEWER_MTIME_THAN:
 426                         {
 427                                 struct stat st;
 428                                 if (stat(optarg, &st) != 0)
 429                                         bsdtar_errc(bsdtar, 1, 0,
 430                                             "Can't open file %s", optarg);
 431                                 bsdtar->newer_mtime_sec = st.st_mtime;
 432                                 bsdtar->newer_mtime_nsec =
 433                                     ARCHIVE_STAT_MTIME_NANOS(&st);
 434                         }
 435                         break;
 436                 case OPTION_NODUMP: /* star */
 437                         bsdtar->option_honor_nodump = 1;
 438                         break;
 439                 case OPTION_NO_SAME_OWNER: /* GNU tar */
 440                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
 441                         break;
 442                 case OPTION_NO_SAME_PERMISSIONS: /* GNU tar */
 443                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_PERM;
 444                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_ACL;
 445                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_XATTR;
 446                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_FFLAGS;
 447                         break;
 448                 case OPTION_NULL: /* GNU tar */
 449                         bsdtar->option_null++;
 450                         break;
 451                 case 'O': /* GNU tar */
 452                         bsdtar->option_stdout = 1;
 453                         break;
 454                 case 'o': /* SUSv2 and GNU conflict here, but not fatally */
 455                         option_o = 1; /* Record it and resolve it later. */
 456                         break;
 457                 case OPTION_ONE_FILE_SYSTEM: /* GNU tar */
 458                         bsdtar->option_dont_traverse_mounts = 1;
 459                         break;
 460 #if 0
 461                 /*
 462                  * The common BSD -P option is not necessary, since
 463                  * our default is to archive symlinks, not follow
 464                  * them.  This is convenient, as -P conflicts with GNU
 465                  * tar anyway.
 466                  */
 467                 case 'P': /* BSD convention */
 468                         /* Default behavior, no option necessary. */
 469                         break;
 470 #endif
 471                 case 'P': /* GNU tar */
 472                         bsdtar->extract_flags &= ~SECURITY;
 473                         bsdtar->option_absolute_paths = 1;
 474                         break;
 475                 case 'p': /* GNU tar, star */
 476                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_PERM;
 477                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_ACL;
 478                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_XATTR;
 479                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_FFLAGS;
 480                         break;
 481                 case 'r': /* SUSv2 */
 482                         set_mode(bsdtar, opt);
 483                         break;
 484                 case OPTION_STRIP_COMPONENTS: /* GNU tar 1.15 */
 485                         bsdtar->strip_components = atoi(optarg);
 486                         break;
 487                 case 'T': /* GNU tar */
 488                         bsdtar->names_from_file = optarg;
 489                         break;
 490                 case 't': /* SUSv2 */
 491                         set_mode(bsdtar, opt);
 492                         bsdtar->verbose++;
 493                         break;
 494                 case OPTION_TOTALS: /* GNU tar */
 495                         bsdtar->option_totals++;
 496                         break;
 497                 case 'U': /* GNU tar */
 498                         bsdtar->extract_flags |= ARCHIVE_EXTRACT_UNLINK;
 499                         bsdtar->option_unlink_first = 1;
 500                         break;
 501                 case 'u': /* SUSv2 */
 502                         set_mode(bsdtar, opt);
 503                         break;
 504                 case 'v': /* SUSv2 */
 505                         bsdtar->verbose++;
 506                         break;
 507                 case OPTION_VERSION: /* GNU convention */
 508                         version();
 509                         break;
 510 #if 0
 511                 /*
 512                  * The -W longopt feature is handled inside of
 513                  * bsdtar_getop(), so -W is not available here.
 514                  */
 515                 case 'W': /* Obscure, but useful GNU convention. */
 516                         break;
 517 #endif
 518                 case 'w': /* SUSv2 */
 519                         bsdtar->option_interactive = 1;
 520                         break;
 521                 case 'X': /* GNU tar */
 522                         if (exclude_from_file(bsdtar, optarg))
 523                                 bsdtar_errc(bsdtar, 1, 0,
 524                                     "failed to process exclusions from file %s",
 525                                     optarg);
 526                         break;
 527                 case 'x': /* SUSv2 */
 528                         set_mode(bsdtar, opt);
 529                         break;
 530                 case 'y': /* FreeBSD version of GNU tar */
 531 #if HAVE_LIBBZ2
 532                         if (bsdtar->create_compression != '\0')
 533                                 bsdtar_errc(bsdtar, 1, 0,
 534                                     "Can't specify both -%c and -%c", opt,
 535                                     bsdtar->create_compression);
 536                         bsdtar->create_compression = opt;
 537 #else
 538                         bsdtar_warnc(bsdtar, 0, "-y compression not supported by this version of bsdtar");
 539                         usage(bsdtar);
 540 #endif
 541                         break;
 542                 case 'Z': /* GNU tar */
 543                         if (bsdtar->create_compression != '\0')
 544                                 bsdtar_errc(bsdtar, 1, 0,
 545                                     "Can't specify both -%c and -%c", opt,
 546                                     bsdtar->create_compression);
 547                         bsdtar->create_compression = opt;
 548                         break;
 549                 case 'z': /* GNU tar, star, many others */
 550 #if HAVE_LIBZ
 551                         if (bsdtar->create_compression != '\0')
 552                                 bsdtar_errc(bsdtar, 1, 0,
 553                                     "Can't specify both -%c and -%c", opt,
 554                                     bsdtar->create_compression);
 555                         bsdtar->create_compression = opt;
 556 #else
 557                         bsdtar_warnc(bsdtar, 0, "-z compression not supported by this version of bsdtar");
 558                         usage(bsdtar);
 559 #endif
 560                         break;
 561                 default:
 562                         usage(bsdtar);
 563                 }
 564         }
 565
 566         /*
 567          * Sanity-check options.
 568          */
 569
 570         /* If no "real" mode was specified, treat -h as --help. */
 571         if ((bsdtar->mode == '\0') && possible_help_request) {
 572                 long_help(bsdtar);
 573                 exit(0);
 574         }
 575
 576         /* Otherwise, a mode is required. */
 577         if (bsdtar->mode == '\0')
 578                 bsdtar_errc(bsdtar, 1, 0,
 579                     "Must specify one of -c, -r, -t, -u, -x");
 580
 581         /* Check boolean options only permitted in certain modes. */
 582         if (bsdtar->option_dont_traverse_mounts)
 583                 only_mode(bsdtar, "--one-file-system", "cru");
 584         if (bsdtar->option_fast_read)
 585                 only_mode(bsdtar, "--fast-read", "xt");
 586         if (bsdtar->option_honor_nodump)
 587                 only_mode(bsdtar, "--nodump", "cru");
 588         if (option_o > 0) {
 589                 switch (bsdtar->mode) {
 590                 case 'c':
 591                         /*
 592                          * In GNU tar, -o means "old format."  The
 593                          * "ustar" format is the closest thing
 594                          * supported by libarchive.
 595                          */
 596                         bsdtar->create_format = "ustar";
 597                         /* TODO: bsdtar->create_format = "v7"; */
 598                         break;
 599                 case 'x':
 600                         /* POSIX-compatible behavior. */
 601                         bsdtar->option_no_owner = 1;
 602                         bsdtar->extract_flags &= ~ARCHIVE_EXTRACT_OWNER;
 603                         break;
 604                 default:
 605                         only_mode(bsdtar, "-o", "xc");
 606                         break;
 607                 }
 608         }
 609         if (bsdtar->option_no_subdirs)
 610                 only_mode(bsdtar, "-n", "cru");
 611         if (bsdtar->option_stdout)
 612                 only_mode(bsdtar, "-O", "xt");
 613         if (bsdtar->option_unlink_first)
 614                 only_mode(bsdtar, "-U", "x");
 615         if (bsdtar->option_warn_links)
 616                 only_mode(bsdtar, "--check-links", "cr");
 617
 618         /* Check other parameters only permitted in certain modes. */
 619         if (bsdtar->create_compression == 'Z' && bsdtar->mode == 'c') {
 620                 bsdtar_warnc(bsdtar, 0, ".Z compression not supported");
 621                 usage(bsdtar);
 622         }
 623         if (bsdtar->create_compression != '\0') {
 624                 strcpy(buff, "-?");
 625                 buff[1] = bsdtar->create_compression;
 626                 only_mode(bsdtar, buff, "cxt");
 627         }
 628         if (bsdtar->create_format != NULL)
 629                 only_mode(bsdtar, "--format", "c");
 630         if (bsdtar->symlink_mode != '\0') {
 631                 strcpy(buff, "-?");
 632                 buff[1] = bsdtar->symlink_mode;
 633                 only_mode(bsdtar, buff, "cru");
 634         }
 635         if (bsdtar->strip_components != 0)
 636                 only_mode(bsdtar, "--strip-components", "xt");
 637
 638         bsdtar->argc -= optind;
 639         bsdtar->argv += optind;
 640
 641         switch(bsdtar->mode) {
 642         case 'c':
 643                 tar_mode_c(bsdtar);
 644                 break;
 645         case 'r':
 646                 tar_mode_r(bsdtar);
 647                 break;
 648         case 't':
 649                 tar_mode_t(bsdtar);
 650                 break;
 651         case 'u':
 652                 tar_mode_u(bsdtar);
 653                 break;
 654         case 'x':
 655                 tar_mode_x(bsdtar);
 656                 break;
 657         }
 658
 659         cleanup_exclusions(bsdtar);
 660         return (bsdtar->return_value);
 661 }
 662
 663 static void
 664 set_mode(struct bsdtar *bsdtar, char opt)
 665 {
 666         if (bsdtar->mode != '\0' && bsdtar->mode != opt)
 667                 bsdtar_errc(bsdtar, 1, 0,
 668                     "Can't specify both -%c and -%c", opt, bsdtar->mode);
 669         bsdtar->mode = opt;
 670 }
 671
 672 /*
 673  * Verify that the mode is correct.
 674  */
 675 static void
 676 only_mode(struct bsdtar *bsdtar, const char *opt, const char *valid_modes)
 677 {
 678         if (strchr(valid_modes, bsdtar->mode) == NULL)
 679                 bsdtar_errc(bsdtar, 1, 0,
 680                     "Option %s is not permitted in mode -%c",
 681                     opt, bsdtar->mode);
 682 }
 683
 684
 685 /*-
 686  * Convert traditional tar arguments into new-style.
 687  * For example,
 688  *     tar tvfb file.tar 32 --exclude FOO
 689  * will be converted to
 690  *     tar -t -v -f file.tar -b 32 --exclude FOO
 691  *
 692  * This requires building a new argv array.  The initial bundled word
 693  * gets expanded into a new string that looks like "-t\0-v\0-f\0-b\0".
 694  * The new argv array has pointers into this string intermingled with
 695  * pointers to the existing arguments.  Arguments are moved to
 696  * immediately follow their options.
 697  *
 698  * The optstring argument here is the same one passed to getopt(3).
 699  * It is used to determine which option letters have trailing arguments.
 700  */
 701 char **
 702 rewrite_argv(struct bsdtar *bsdtar, int *argc, char **src_argv,
 703     const char *optstring)
 704 {
 705         char **new_argv, **dest_argv;
 706         const char *p;
 707         char *src, *dest;
 708
 709         if (src_argv[0] == NULL ||
 710             src_argv[1] == NULL || src_argv[1][0] == '-')
 711                 return (src_argv);
 712
 713         *argc += strlen(src_argv[1]) - 1;
 714         new_argv = malloc((*argc + 1) * sizeof(new_argv[0]));
 715         if (new_argv == NULL)
 716                 bsdtar_errc(bsdtar, 1, errno, "No Memory");
 717
 718         dest_argv = new_argv;
 719         *dest_argv++ = *src_argv++;
 720
 721         dest = malloc(strlen(*src_argv) * 3);
 722         if (dest == NULL)
 723                 bsdtar_errc(bsdtar, 1, errno, "No memory");
 724         for (src = *src_argv++; *src != '\0'; src++) {
 725                 *dest_argv++ = dest;
 726                 *dest++ = '-';
 727                 *dest++ = *src;
 728                 *dest++ = '\0';
 729                 /* If option takes an argument, insert that into the list. */
 730                 for (p = optstring; p != NULL && *p != '\0'; p++) {
 731                         if (*p != *src)
 732                                 continue;
 733                         if (p[1] != ':')        /* No arg required, done. */
 734                                 break;
 735                         if (*src_argv == NULL)  /* No arg available? Error. */
 736                                 bsdtar_errc(bsdtar, 1, 0,
 737                                     "Option %c requires an argument",
 738                                     *src);
 739                         *dest_argv++ = *src_argv++;
 740                         break;
 741                 }
 742         }
 743
 744         /* Copy remaining arguments, including trailing NULL. */
 745         while ((*dest_argv++ = *src_argv++) != NULL)
 746                 ;
 747
 748         return (new_argv);
 749 }
 750
 751 void
 752 usage(struct bsdtar *bsdtar)
 753 {
 754         const char      *p;
 755
 756         p = bsdtar->progname;
 757
 758         fprintf(stderr, "Usage:\n");
 759         fprintf(stderr, "  List:    %s -tf <archive-filename>\n", p);
 760         fprintf(stderr, "  Extract: %s -xf <archive-filename>\n", p);
 761         fprintf(stderr, "  Create:  %s -cf <archive-filename> [filenames...]\n", p);
 762 #ifdef HAVE_GETOPT_LONG
 763         fprintf(stderr, "  Help:    %s --help\n", p);
 764 #else
 765         fprintf(stderr, "  Help:    %s -h\n", p);
 766 #endif
 767         exit(1);
 768 }
 769
 770 static void
 771 version(void)
 772 {
 773         printf("bsdtar %s - %s\n", PACKAGE_VERSION, archive_version());
 774         exit(1);
 775 }
 776
 777 static const char *long_help_msg =
 778         "First option must be a mode specifier:\n"
 779         "  -c Create  -r Add/Replace  -t List  -u Update  -x Extract\n"
 780         "Common Options:\n"
 781         "  -b #  Use # 512-byte records per I/O block\n"
 782         "  -f <filename>  Location of archive (default " _PATH_DEFTAPE ")\n"
 783         "  -v    Verbose\n"
 784         "  -w    Interactive\n"
 785         "Create: %p -c [options] [<file> | <dir> | @<archive> | -C <dir> ]\n"
 786         "  <file>, <dir>  add these items to archive\n"
 787         "  -z, -j  Compress archive with gzip/bzip2\n"
 788         "  --format {ustar|pax|cpio|shar}  Select archive format\n"
 789 #ifdef HAVE_GETOPT_LONG
 790         "  --exclude <pattern>  Skip files that match pattern\n"
 791 #else
 792         "  -W exclude=<pattern>  Skip files that match pattern\n"
 793 #endif
 794         "  -C <dir>  Change to <dir> before processing remaining files\n"
 795         "  @<archive>  Add entries from <archive> to output\n"
 796         "List: %p -t [options] [<patterns>]\n"
 797         "  <patterns>  If specified, list only entries that match\n"
 798         "Extract: %p -x [options] [<patterns>]\n"
 799         "  <patterns>  If specified, extract only entries that match\n"
 800         "  -k    Keep (don't overwrite) existing files\n"
 801         "  -m    Don't restore modification times\n"
 802         "  -O    Write entries to stdout, don't restore to disk\n"
 803         "  -p    Restore permissions (including ACLs, owner, file flags)\n";
 804
 805
 806 /*
 807  * Note that the word 'bsdtar' will always appear in the first line
 808  * of output.
 809  *
 810  * In particular, /bin/sh scripts that need to test for the presence
 811  * of bsdtar can use the following template:
 812  *
 813  * if (tar --help 2>&1 | grep bsdtar >/dev/null 2>&1 ) then \
 814  *          echo bsdtar; else echo not bsdtar; fi
 815  */
 816 static void
 817 long_help(struct bsdtar *bsdtar)
 818 {
 819         const char      *prog;
 820         const char      *p;
 821
 822         prog = bsdtar->progname;
 823
 824         fflush(stderr);
 825
 826         p = (strcmp(prog,"bsdtar") != 0) ? "(bsdtar)" : "";
 827         printf("%s%s: manipulate archive files\n", prog, p);
 828
 829         for (p = long_help_msg; *p != '\0'; p++) {
 830                 if (*p == '%') {
 831                         if (p[1] == 'p') {
 832                                 fputs(prog, stdout);
 833                                 p++;
 834                         } else
 835                                 putchar('%');
 836                 } else
 837                         putchar(*p);
 838         }
 839         version();
 840 }
 841
 842 static int
 843 bsdtar_getopt(struct bsdtar *bsdtar, const char *optstring,
 844     const struct option **poption)
 845 {
 846         char *p, *q;
 847         const struct option *option;
 848         int opt;
 849         int option_index;
 850         size_t option_length;
 851
 852         option_index = -1;
 853         *poption = NULL;
 854
 855 #ifdef HAVE_GETOPT_LONG
 856         opt = getopt_long(bsdtar->argc, bsdtar->argv, optstring,
 857             tar_longopts, &option_index);
 858         if (option_index > -1)
 859                 *poption = tar_longopts + option_index;
 860 #else
 861         opt = getopt(bsdtar->argc, bsdtar->argv, optstring);
 862 #endif
 863
 864         /* Support long options through -W longopt=value */
 865         if (opt == 'W') {
 866                 p = optarg;
 867                 q = strchr(optarg, '=');
 868                 if (q != NULL) {
 869                         option_length = (size_t)(q - p);
 870                         optarg = q + 1;
 871                 } else {
 872                         option_length = strlen(p);
 873                         optarg = NULL;
 874                 }
 875                 option = tar_longopts;
 876                 while (option->name != NULL &&
 877                     (strlen(option->name) < option_length ||
 878                     strncmp(p, option->name, option_length) != 0 )) {
 879                         option++;
 880                 }
 881
 882                 if (option->name != NULL) {
 883                         *poption = option;
 884                         opt = option->val;
 885
 886                         /* If the first match was exact, we're done. */
 887                         if (strncmp(p, option->name, strlen(option->name)) == 0) {
 888                                 while (option->name != NULL)
 889                                         option++;
 890                         } else {
 891                                 /* Check if there's another match. */
 892                                 option++;
 893                                 while (option->name != NULL &&
 894                                     (strlen(option->name) < option_length ||
 895                                     strncmp(p, option->name, option_length) != 0)) {
 896                                         option++;
 897                                 }
 898                         }
 899                         if (option->name != NULL)
 900                                 bsdtar_errc(bsdtar, 1, 0,
 901                                     "Ambiguous option %s "
 902                                     "(matches both %s and %s)",
 903                                     p, (*poption)->name, option->name);
 904
 905                 } else {
 906                         opt = '?';
 907                         /* TODO: Set up a fake 'struct option' for
 908                          * error reporting... ? ? ? */
 909                 }
 910         }
 911
 912         return (opt);
 913 }