contrib/libarchive/tar/cmdline.c

   1 /*-
   2  * Copyright (c) 2003-2008 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 /*
  27  * Command line parser for tar.
  28  */
  29
  30 #include "bsdtar_platform.h"
  31 __FBSDID("$FreeBSD$");
  32
  33 #ifdef HAVE_ERRNO_H
  34 #include <errno.h>
  35 #endif
  36 #ifdef HAVE_STDLIB_H
  37 #include <stdlib.h>
  38 #endif
  39 #ifdef HAVE_STRING_H
  40 #include <string.h>
  41 #endif
  42
  43 #include "bsdtar.h"
  44 #include "err.h"
  45
  46 /*
  47  * Short options for tar.  Please keep this sorted.
  48  */
  49 static const char *short_options
  50         = "aBb:C:cf:HhI:JjkLlmnOoPpqrSs:T:tUuvW:wX:xyZz";
  51
  52 /*
  53  * Long options for tar.  Please keep this list sorted.
  54  *
  55  * The symbolic names for options that lack a short equivalent are
  56  * defined in bsdtar.h.  Also note that so far I've found no need
  57  * to support optional arguments to long options.  That would be
  58  * a small change to the code below.
  59  */
  60
  61 static const struct bsdtar_option {
  62         const char *name;
  63         int required;      /* 1 if this option requires an argument. */
  64         int equivalent;    /* Equivalent short option. */
  65 } tar_longopts[] = {
  66         { "absolute-paths",       0, 'P' },
  67         { "append",               0, 'r' },
  68         { "auto-compress",        0, 'a' },
  69         { "b64encode",            0, OPTION_B64ENCODE },
  70         { "block-size",           1, 'b' },
  71         { "bunzip2",              0, 'j' },
  72         { "bzip",                 0, 'j' },
  73         { "bzip2",                0, 'j' },
  74         { "cd",                   1, 'C' },
  75         { "check-links",          0, OPTION_CHECK_LINKS },
  76         { "chroot",               0, OPTION_CHROOT },
  77         { "clear-nochange-fflags", 0, OPTION_CLEAR_NOCHANGE_FFLAGS },
  78         { "compress",             0, 'Z' },
  79         { "confirmation",         0, 'w' },
  80         { "create",               0, 'c' },
  81         { "dereference",          0, 'L' },
  82         { "directory",            1, 'C' },
  83         { "disable-copyfile",     0, OPTION_DISABLE_COPYFILE },
  84         { "exclude",              1, OPTION_EXCLUDE },
  85         { "exclude-from",         1, 'X' },
  86         { "extract",              0, 'x' },
  87         { "fast-read",            0, 'q' },
  88         { "file",                 1, 'f' },
  89         { "files-from",           1, 'T' },
  90         { "format",               1, OPTION_FORMAT },
  91         { "gid",                  1, OPTION_GID },
  92         { "gname",                1, OPTION_GNAME },
  93         { "grzip",                0, OPTION_GRZIP },
  94         { "gunzip",               0, 'z' },
  95         { "gzip",                 0, 'z' },
  96         { "help",                 0, OPTION_HELP },
  97         { "hfsCompression",       0, OPTION_HFS_COMPRESSION },
  98         { "ignore-zeros",         0, OPTION_IGNORE_ZEROS },
  99         { "include",              1, OPTION_INCLUDE },
 100         { "insecure",             0, 'P' },
 101         { "interactive",          0, 'w' },
 102         { "keep-newer-files",     0, OPTION_KEEP_NEWER_FILES },
 103         { "keep-old-files",       0, 'k' },
 104         { "list",                 0, 't' },
 105         { "lrzip",                0, OPTION_LRZIP },
 106         { "lz4",                  0, OPTION_LZ4 },
 107         { "lzip",                 0, OPTION_LZIP },
 108         { "lzma",                 0, OPTION_LZMA },
 109         { "lzop",                 0, OPTION_LZOP },
 110         { "modification-time",    0, 'm' },
 111         { "newer",                1, OPTION_NEWER_CTIME },
 112         { "newer-ctime",          1, OPTION_NEWER_CTIME },
 113         { "newer-ctime-than",     1, OPTION_NEWER_CTIME_THAN },
 114         { "newer-mtime",          1, OPTION_NEWER_MTIME },
 115         { "newer-mtime-than",     1, OPTION_NEWER_MTIME_THAN },
 116         { "newer-than",           1, OPTION_NEWER_CTIME_THAN },
 117         { "no-recursion",         0, 'n' },
 118         { "no-same-owner",        0, OPTION_NO_SAME_OWNER },
 119         { "no-same-permissions",  0, OPTION_NO_SAME_PERMISSIONS },
 120         { "no-xattr",             0, OPTION_NO_XATTR },
 121         { "nodump",               0, OPTION_NODUMP },
 122         { "nopreserveHFSCompression",0, OPTION_NOPRESERVE_HFS_COMPRESSION },
 123         { "norecurse",            0, 'n' },
 124         { "null",                 0, OPTION_NULL },
 125         { "numeric-owner",        0, OPTION_NUMERIC_OWNER },
 126         { "older",                1, OPTION_OLDER_CTIME },
 127         { "older-ctime",          1, OPTION_OLDER_CTIME },
 128         { "older-ctime-than",     1, OPTION_OLDER_CTIME_THAN },
 129         { "older-mtime",          1, OPTION_OLDER_MTIME },
 130         { "older-mtime-than",     1, OPTION_OLDER_MTIME_THAN },
 131         { "older-than",           1, OPTION_OLDER_CTIME_THAN },
 132         { "one-file-system",      0, OPTION_ONE_FILE_SYSTEM },
 133         { "options",              1, OPTION_OPTIONS },
 134         { "passphrase",           1, OPTION_PASSPHRASE },
 135         { "posix",                0, OPTION_POSIX },
 136         { "preserve-permissions", 0, 'p' },
 137         { "read-full-blocks",     0, 'B' },
 138         { "same-owner",           0, OPTION_SAME_OWNER },
 139         { "same-permissions",     0, 'p' },
 140         { "strip-components",     1, OPTION_STRIP_COMPONENTS },
 141         { "to-stdout",            0, 'O' },
 142         { "totals",               0, OPTION_TOTALS },
 143         { "uid",                  1, OPTION_UID },
 144         { "uname",                1, OPTION_UNAME },
 145         { "uncompress",           0, 'Z' },
 146         { "unlink",               0, 'U' },
 147         { "unlink-first",         0, 'U' },
 148         { "update",               0, 'u' },
 149         { "use-compress-program", 1, OPTION_USE_COMPRESS_PROGRAM },
 150         { "uuencode",             0, OPTION_UUENCODE },
 151         { "verbose",              0, 'v' },
 152         { "version",              0, OPTION_VERSION },
 153         { "xz",                   0, 'J' },
 154         { NULL, 0, 0 }
 155 };
 156
 157 /*
 158  * This getopt implementation has two key features that common
 159  * getopt_long() implementations lack.  Apart from those, it's a
 160  * straightforward option parser, considerably simplified by not
 161  * needing to support the wealth of exotic getopt_long() features.  It
 162  * has, of course, been shamelessly tailored for bsdtar.  (If you're
 163  * looking for a generic getopt_long() implementation for your
 164  * project, I recommend Gregory Pietsch's public domain getopt_long()
 165  * implementation.)  The two additional features are:
 166  *
 167  * Old-style tar arguments: The original tar implementation treated
 168  * the first argument word as a list of single-character option
 169  * letters.  All arguments follow as separate words.  For example,
 170  *    tar xbf 32 /dev/tape
 171  * Here, the "xbf" is three option letters, "32" is the argument for
 172  * "b" and "/dev/tape" is the argument for "f".  We support this usage
 173  * if the first command-line argument does not begin with '-'.  We
 174  * also allow regular short and long options to follow, e.g.,
 175  *    tar xbf 32 /dev/tape -P --format=pax
 176  *
 177  * -W long options: There's an obscure GNU convention (only rarely
 178  * supported even there) that allows "-W option=argument" as an
 179  * alternative way to support long options.  This was supported in
 180  * early bsdtar as a way to access long options on platforms that did
 181  * not support getopt_long() and is preserved here for backwards
 182  * compatibility.  (Of course, if I'd started with a custom
 183  * command-line parser from the beginning, I would have had normal
 184  * long option support on every platform so that hack wouldn't have
 185  * been necessary.  Oh, well.  Some mistakes you just have to live
 186  * with.)
 187  *
 188  * TODO: We should be able to use this to pull files and intermingled
 189  * options (such as -C) from the command line in write mode.  That
 190  * will require a little rethinking of the argument handling in
 191  * bsdtar.c.
 192  *
 193  * TODO: If we want to support arbitrary command-line options from -T
 194  * input (as GNU tar does), we may need to extend this to handle option
 195  * words from sources other than argv/argc.  I'm not really sure if I
 196  * like that feature of GNU tar, so it's certainly not a priority.
 197  */
 198
 199 int
 200 bsdtar_getopt(struct bsdtar *bsdtar)
 201 {
 202         enum { state_start = 0, state_old_tar, state_next_word,
 203                state_short, state_long };
 204
 205         const struct bsdtar_option *popt, *match = NULL, *match2 = NULL;
 206         const char *p, *long_prefix = "--";
 207         size_t optlength;
 208         int opt = '?';
 209         int required = 0;
 210
 211         bsdtar->argument = NULL;
 212
 213         /* First time through, initialize everything. */
 214         if (bsdtar->getopt_state == state_start) {
 215                 /* Skip program name. */
 216                 ++bsdtar->argv;
 217                 --bsdtar->argc;
 218                 if (*bsdtar->argv == NULL)
 219                         return (-1);
 220                 /* Decide between "new style" and "old style" arguments. */
 221                 if (bsdtar->argv[0][0] == '-') {
 222                         bsdtar->getopt_state = state_next_word;
 223                 } else {
 224                         bsdtar->getopt_state = state_old_tar;
 225                         bsdtar->getopt_word = *bsdtar->argv++;
 226                         --bsdtar->argc;
 227                 }
 228         }
 229
 230         /*
 231          * We're parsing old-style tar arguments
 232          */
 233         if (bsdtar->getopt_state == state_old_tar) {
 234                 /* Get the next option character. */
 235                 opt = *bsdtar->getopt_word++;
 236                 if (opt == '\0') {
 237                         /* New-style args can follow old-style. */
 238                         bsdtar->getopt_state = state_next_word;
 239                 } else {
 240                         /* See if it takes an argument. */
 241                         p = strchr(short_options, opt);
 242                         if (p == NULL)
 243                                 return ('?');
 244                         if (p[1] == ':') {
 245                                 bsdtar->argument = *bsdtar->argv;
 246                                 if (bsdtar->argument == NULL) {
 247                                         lafe_warnc(0,
 248                                             "Option %c requires an argument",
 249                                             opt);
 250                                         return ('?');
 251                                 }
 252                                 ++bsdtar->argv;
 253                                 --bsdtar->argc;
 254                         }
 255                 }
 256         }
 257
 258         /*
 259          * We're ready to look at the next word in argv.
 260          */
 261         if (bsdtar->getopt_state == state_next_word) {
 262                 /* No more arguments, so no more options. */
 263                 if (bsdtar->argv[0] == NULL)
 264                         return (-1);
 265                 /* Doesn't start with '-', so no more options. */
 266                 if (bsdtar->argv[0][0] != '-')
 267                         return (-1);
 268                 /* "--" marks end of options; consume it and return. */
 269                 if (strcmp(bsdtar->argv[0], "--") == 0) {
 270                         ++bsdtar->argv;
 271                         --bsdtar->argc;
 272                         return (-1);
 273                 }
 274                 /* Get next word for parsing. */
 275                 bsdtar->getopt_word = *bsdtar->argv++;
 276                 --bsdtar->argc;
 277                 if (bsdtar->getopt_word[1] == '-') {
 278                         /* Set up long option parser. */
 279                         bsdtar->getopt_state = state_long;
 280                         bsdtar->getopt_word += 2; /* Skip leading '--' */
 281                 } else {
 282                         /* Set up short option parser. */
 283                         bsdtar->getopt_state = state_short;
 284                         ++bsdtar->getopt_word;  /* Skip leading '-' */
 285                 }
 286         }
 287
 288         /*
 289          * We're parsing a group of POSIX-style single-character options.
 290          */
 291         if (bsdtar->getopt_state == state_short) {
 292                 /* Peel next option off of a group of short options. */
 293                 opt = *bsdtar->getopt_word++;
 294                 if (opt == '\0') {
 295                         /* End of this group; recurse to get next option. */
 296                         bsdtar->getopt_state = state_next_word;
 297                         return bsdtar_getopt(bsdtar);
 298                 }
 299
 300                 /* Does this option take an argument? */
 301                 p = strchr(short_options, opt);
 302                 if (p == NULL)
 303                         return ('?');
 304                 if (p[1] == ':')
 305                         required = 1;
 306
 307                 /* If it takes an argument, parse that. */
 308                 if (required) {
 309                         /* If arg is run-in, bsdtar->getopt_word already points to it. */
 310                         if (bsdtar->getopt_word[0] == '\0') {
 311                                 /* Otherwise, pick up the next word. */
 312                                 bsdtar->getopt_word = *bsdtar->argv;
 313                                 if (bsdtar->getopt_word == NULL) {
 314                                         lafe_warnc(0,
 315                                             "Option -%c requires an argument",
 316                                             opt);
 317                                         return ('?');
 318                                 }
 319                                 ++bsdtar->argv;
 320                                 --bsdtar->argc;
 321                         }
 322                         if (opt == 'W') {
 323                                 bsdtar->getopt_state = state_long;
 324                                 long_prefix = "-W "; /* For clearer errors. */
 325                         } else {
 326                                 bsdtar->getopt_state = state_next_word;
 327                                 bsdtar->argument = bsdtar->getopt_word;
 328                         }
 329                 }
 330         }
 331
 332         /* We're reading a long option, including -W long=arg convention. */
 333         if (bsdtar->getopt_state == state_long) {
 334                 /* After this long option, we'll be starting a new word. */
 335                 bsdtar->getopt_state = state_next_word;
 336
 337                 /* Option name ends at '=' if there is one. */
 338                 p = strchr(bsdtar->getopt_word, '=');
 339                 if (p != NULL) {
 340                         optlength = (size_t)(p - bsdtar->getopt_word);
 341                         bsdtar->argument = (char *)(uintptr_t)(p + 1);
 342                 } else {
 343                         optlength = strlen(bsdtar->getopt_word);
 344                 }
 345
 346                 /* Search the table for an unambiguous match. */
 347                 for (popt = tar_longopts; popt->name != NULL; popt++) {
 348                         /* Short-circuit if first chars don't match. */
 349                         if (popt->name[0] != bsdtar->getopt_word[0])
 350                                 continue;
 351                         /* If option is a prefix of name in table, record it.*/
 352                         if (strncmp(bsdtar->getopt_word, popt->name, optlength) == 0) {
 353                                 match2 = match; /* Record up to two matches. */
 354                                 match = popt;
 355                                 /* If it's an exact match, we're done. */
 356                                 if (strlen(popt->name) == optlength) {
 357                                         match2 = NULL; /* Forget the others. */
 358                                         break;
 359                                 }
 360                         }
 361                 }
 362
 363                 /* Fail if there wasn't a unique match. */
 364                 if (match == NULL) {
 365                         lafe_warnc(0,
 366                             "Option %s%s is not supported",
 367                             long_prefix, bsdtar->getopt_word);
 368                         return ('?');
 369                 }
 370                 if (match2 != NULL) {
 371                         lafe_warnc(0,
 372                             "Ambiguous option %s%s (matches --%s and --%s)",
 373                             long_prefix, bsdtar->getopt_word, match->name, match2->name);
 374                         return ('?');
 375                 }
 376
 377                 /* We've found a unique match; does it need an argument? */
 378                 if (match->required) {
 379                         /* Argument required: get next word if necessary. */
 380                         if (bsdtar->argument == NULL) {
 381                                 bsdtar->argument = *bsdtar->argv;
 382                                 if (bsdtar->argument == NULL) {
 383                                         lafe_warnc(0,
 384                                             "Option %s%s requires an argument",
 385                                             long_prefix, match->name);
 386                                         return ('?');
 387                                 }
 388                                 ++bsdtar->argv;
 389                                 --bsdtar->argc;
 390                         }
 391                 } else {
 392                         /* Argument forbidden: fail if there is one. */
 393                         if (bsdtar->argument != NULL) {
 394                                 lafe_warnc(0,
 395                                     "Option %s%s does not allow an argument",
 396                                     long_prefix, match->name);
 397                                 return ('?');
 398                         }
 399                 }
 400                 return (match->equivalent);
 401         }
 402
 403         return (opt);
 404 }