usr.bin/tar/read.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("$FreeBSD$");
  28
  29 #ifdef HAVE_SYS_TYPES_H
  30 #include <sys/types.h>
  31 #endif
  32 #ifdef MAJOR_IN_MKDEV
  33 #include <sys/mkdev.h>
  34 #elif defined(MAJOR_IN_SYSMACROS)
  35 #include <sys/sysmacros.h>
  36 #endif
  37 #ifdef HAVE_SYS_PARAM_H
  38 #include <sys/param.h>
  39 #endif
  40 #ifdef HAVE_SYS_STAT_H
  41 #include <sys/stat.h>
  42 #endif
  43
  44 #ifdef HAVE_ERRNO_H
  45 #include <errno.h>
  46 #endif
  47 #ifdef HAVE_GRP_H
  48 #include <grp.h>
  49 #endif
  50 #ifdef HAVE_LIMITS_H
  51 #include <limits.h>
  52 #endif
  53 #ifdef HAVE_PWD_H
  54 #include <pwd.h>
  55 #endif
  56 #include <stdio.h>
  57 #ifdef HAVE_STDLIB_H
  58 #include <stdlib.h>
  59 #endif
  60 #ifdef HAVE_STRING_H
  61 #include <string.h>
  62 #endif
  63 #ifdef HAVE_TIME_H
  64 #include <time.h>
  65 #endif
  66 #ifdef HAVE_UNISTD_H
  67 #include <unistd.h>
  68 #endif
  69
  70 #include "bsdtar.h"
  71
  72 static void     list_item_verbose(struct bsdtar *, FILE *,
  73                     struct archive_entry *);
  74 static void     read_archive(struct bsdtar *bsdtar, char mode);
  75
  76 void
  77 tar_mode_t(struct bsdtar *bsdtar)
  78 {
  79         read_archive(bsdtar, 't');
  80 }
  81
  82 void
  83 tar_mode_x(struct bsdtar *bsdtar)
  84 {
  85         read_archive(bsdtar, 'x');
  86 }
  87
  88 /*
  89  * Handle 'x' and 't' modes.
  90  */
  91 static void
  92 read_archive(struct bsdtar *bsdtar, char mode)
  93 {
  94         FILE                     *out;
  95         struct archive           *a;
  96         struct archive_entry     *entry;
  97         const struct stat        *st;
  98         int                       r;
  99
 100         while (*bsdtar->argv) {
 101                 include(bsdtar, *bsdtar->argv);
 102                 bsdtar->argv++;
 103         }
 104
 105         if (bsdtar->names_from_file != NULL)
 106                 include_from_file(bsdtar, bsdtar->names_from_file);
 107
 108         a = archive_read_new();
 109         if (bsdtar->compress_program != NULL)
 110                 archive_read_support_compression_program(a, bsdtar->compress_program);
 111         else
 112                 archive_read_support_compression_all(a);
 113         archive_read_support_format_all(a);
 114         if (archive_read_open_file(a, bsdtar->filename,
 115             bsdtar->bytes_per_block != 0 ? bsdtar->bytes_per_block :
 116             DEFAULT_BYTES_PER_BLOCK))
 117                 bsdtar_errc(bsdtar, 1, 0, "Error opening archive: %s",
 118                     archive_error_string(a));
 119
 120         do_chdir(bsdtar);
 121
 122         if (mode == 'x' && bsdtar->option_chroot) {
 123 #if HAVE_CHROOT
 124                 if (chroot(".") != 0)
 125                         bsdtar_errc(bsdtar, 1, errno, "Can't chroot to \".\"");
 126 #else
 127                 bsdtar_errc(bsdtar, 1, 0,
 128                     "chroot isn't supported on this platform");
 129 #endif
 130         }
 131
 132         for (;;) {
 133                 /* Support --fast-read option */
 134                 if (bsdtar->option_fast_read &&
 135                     unmatched_inclusions(bsdtar) == 0)
 136                         break;
 137
 138                 r = archive_read_next_header(a, &entry);
 139                 if (r == ARCHIVE_EOF)
 140                         break;
 141                 if (r < ARCHIVE_OK)
 142                         bsdtar_warnc(bsdtar, 0, "%s", archive_error_string(a));
 143                 if (r <= ARCHIVE_WARN)
 144                         bsdtar->return_value = 1;
 145                 if (r == ARCHIVE_RETRY) {
 146                         /* Retryable error: try again */
 147                         bsdtar_warnc(bsdtar, 0, "Retrying...");
 148                         continue;
 149                 }
 150                 if (r == ARCHIVE_FATAL)
 151                         break;
 152
 153                 /*
 154                  * Exclude entries that are too old.
 155                  */
 156                 st = archive_entry_stat(entry);
 157                 if (bsdtar->newer_ctime_sec > 0) {
 158                         if (st->st_ctime < bsdtar->newer_ctime_sec)
 159                                 continue; /* Too old, skip it. */
 160                         if (st->st_ctime == bsdtar->newer_ctime_sec
 161                             && ARCHIVE_STAT_CTIME_NANOS(st)
 162                             <= bsdtar->newer_ctime_nsec)
 163                                 continue; /* Too old, skip it. */
 164                 }
 165                 if (bsdtar->newer_mtime_sec > 0) {
 166                         if (st->st_mtime < bsdtar->newer_mtime_sec)
 167                                 continue; /* Too old, skip it. */
 168                         if (st->st_mtime == bsdtar->newer_mtime_sec
 169                             && ARCHIVE_STAT_MTIME_NANOS(st)
 170                             <= bsdtar->newer_mtime_nsec)
 171                                 continue; /* Too old, skip it. */
 172                 }
 173
 174                 /*
 175                  * Note that pattern exclusions are checked before
 176                  * pathname rewrites are handled.  This gives more
 177                  * control over exclusions, since rewrites always lose
 178                  * information.  (For example, consider a rewrite
 179                  * s/foo[0-9]/foo/.  If we check exclusions after the
 180                  * rewrite, there would be no way to exclude foo1/bar
 181                  * while allowing foo2/bar.)
 182                  */
 183                 if (excluded(bsdtar, archive_entry_pathname(entry)))
 184                         continue; /* Excluded by a pattern test. */
 185
 186                 /*
 187                  * Modify the pathname as requested by the user.  We
 188                  * do this for -t as well to give users a way to
 189                  * preview the effects of their rewrites.  We also do
 190                  * this before extraction security checks (including
 191                  * leading '/' removal).  Note that some rewrite
 192                  * failures prevent extraction.
 193                  */
 194                 if (edit_pathname(bsdtar, entry))
 195                         continue; /* Excluded by a rewrite failure. */
 196
 197                 if (mode == 't') {
 198                         /* Perversely, gtar uses -O to mean "send to stderr"
 199                          * when used with -t. */
 200                         out = bsdtar->option_stdout ? stderr : stdout;
 201
 202                         if (bsdtar->verbose < 2)
 203                                 safe_fprintf(out, "%s",
 204                                     archive_entry_pathname(entry));
 205                         else
 206                                 list_item_verbose(bsdtar, out, entry);
 207                         fflush(out);
 208                         r = archive_read_data_skip(a);
 209                         if (r == ARCHIVE_WARN) {
 210                                 fprintf(out, "\n");
 211                                 bsdtar_warnc(bsdtar, 0, "%s",
 212                                     archive_error_string(a));
 213                         }
 214                         if (r == ARCHIVE_RETRY) {
 215                                 fprintf(out, "\n");
 216                                 bsdtar_warnc(bsdtar, 0, "%s",
 217                                     archive_error_string(a));
 218                         }
 219                         if (r == ARCHIVE_FATAL) {
 220                                 fprintf(out, "\n");
 221                                 bsdtar_warnc(bsdtar, 0, "%s",
 222                                     archive_error_string(a));
 223                                 bsdtar->return_value = 1;
 224                                 break;
 225                         }
 226                         fprintf(out, "\n");
 227                 } else {
 228                         if (bsdtar->option_interactive &&
 229                             !yes("extract '%s'", archive_entry_pathname(entry)))
 230                                 continue;
 231
 232                         /*
 233                          * Format here is from SUSv2, including the
 234                          * deferred '\n'.
 235                          */
 236                         if (bsdtar->verbose) {
 237                                 safe_fprintf(stderr, "x %s",
 238                                     archive_entry_pathname(entry));
 239                                 fflush(stderr);
 240                         }
 241                         if (bsdtar->option_stdout)
 242                                 r = archive_read_data_into_fd(a, 1);
 243                         else
 244                                 r = archive_read_extract(a, entry,
 245                                     bsdtar->extract_flags);
 246                         if (r != ARCHIVE_OK) {
 247                                 if (!bsdtar->verbose)
 248                                         safe_fprintf(stderr, "%s",
 249                                             archive_entry_pathname(entry));
 250                                 safe_fprintf(stderr, ": %s",
 251                                     archive_error_string(a));
 252                                 if (!bsdtar->verbose)
 253                                         fprintf(stderr, "\n");
 254                                 bsdtar->return_value = 1;
 255                         }
 256                         if (bsdtar->verbose)
 257                                 fprintf(stderr, "\n");
 258                         if (r == ARCHIVE_FATAL)
 259                                 break;
 260                 }
 261         }
 262
 263         if (bsdtar->verbose > 2)
 264                 fprintf(stdout, "Archive Format: %s,  Compression: %s\n",
 265                     archive_format_name(a), archive_compression_name(a));
 266
 267         archive_read_finish(a);
 268 }
 269
 270
 271 /*
 272  * Display information about the current file.
 273  *
 274  * The format here roughly duplicates the output of 'ls -l'.
 275  * This is based on SUSv2, where 'tar tv' is documented as
 276  * listing additional information in an "unspecified format,"
 277  * and 'pax -l' is documented as using the same format as 'ls -l'.
 278  */
 279 static void
 280 list_item_verbose(struct bsdtar *bsdtar, FILE *out, struct archive_entry *entry)
 281 {
 282         const struct stat       *st;
 283         char                     tmp[100];
 284         size_t                   w;
 285         const char              *p;
 286         const char              *fmt;
 287         time_t                   tim;
 288         static time_t            now;
 289
 290         st = archive_entry_stat(entry);
 291
 292         /*
 293          * We avoid collecting the entire list in memory at once by
 294          * listing things as we see them.  However, that also means we can't
 295          * just pre-compute the field widths.  Instead, we start with guesses
 296          * and just widen them as necessary.  These numbers are completely
 297          * arbitrary.
 298          */
 299         if (!bsdtar->u_width) {
 300                 bsdtar->u_width = 6;
 301                 bsdtar->gs_width = 13;
 302         }
 303         if (!now)
 304                 time(&now);
 305         fprintf(out, "%s %d ",
 306             archive_entry_strmode(entry),
 307             (int)(st->st_nlink));
 308
 309         /* Use uname if it's present, else uid. */
 310         p = archive_entry_uname(entry);
 311         if ((p == NULL) || (*p == '\0')) {
 312                 sprintf(tmp, "%lu ", (unsigned long)st->st_uid);
 313                 p = tmp;
 314         }
 315         w = strlen(p);
 316         if (w > bsdtar->u_width)
 317                 bsdtar->u_width = w;
 318         fprintf(out, "%-*s ", (int)bsdtar->u_width, p);
 319
 320         /* Use gname if it's present, else gid. */
 321         p = archive_entry_gname(entry);
 322         if (p != NULL && p[0] != '\0') {
 323                 fprintf(out, "%s", p);
 324                 w = strlen(p);
 325         } else {
 326                 sprintf(tmp, "%lu", (unsigned long)st->st_gid);
 327                 w = strlen(tmp);
 328                 fprintf(out, "%s", tmp);
 329         }
 330
 331         /*
 332          * Print device number or file size, right-aligned so as to make
 333          * total width of group and devnum/filesize fields be gs_width.
 334          * If gs_width is too small, grow it.
 335          */
 336         if (S_ISCHR(st->st_mode) || S_ISBLK(st->st_mode)) {
 337                 sprintf(tmp, "%lu,%lu",
 338                     (unsigned long)major(st->st_rdev),
 339                     (unsigned long)minor(st->st_rdev)); /* ls(1) also casts here. */
 340         } else {
 341                 /*
 342                  * Note the use of platform-dependent macros to format
 343                  * the filesize here.  We need the format string and the
 344                  * corresponding type for the cast.
 345                  */
 346                 sprintf(tmp, BSDTAR_FILESIZE_PRINTF,
 347                     (BSDTAR_FILESIZE_TYPE)st->st_size);
 348         }
 349         if (w + strlen(tmp) >= bsdtar->gs_width)
 350                 bsdtar->gs_width = w+strlen(tmp)+1;
 351         fprintf(out, "%*s", (int)(bsdtar->gs_width - w), tmp);
 352
 353         /* Format the time using 'ls -l' conventions. */
 354         tim = (time_t)st->st_mtime;
 355         if (abs(tim - now) > (365/2)*86400)
 356                 fmt = bsdtar->day_first ? "%e %b  %Y" : "%b %e  %Y";
 357         else
 358                 fmt = bsdtar->day_first ? "%e %b %R" : "%b %e %R";
 359         strftime(tmp, sizeof(tmp), fmt, localtime(&tim));
 360         fprintf(out, " %s ", tmp);
 361         safe_fprintf(out, "%s", archive_entry_pathname(entry));
 362
 363         /* Extra information for links. */
 364         if (archive_entry_hardlink(entry)) /* Hard link */
 365                 safe_fprintf(out, " link to %s",
 366                     archive_entry_hardlink(entry));
 367         else if (S_ISLNK(st->st_mode)) /* Symbolic link */
 368                 safe_fprintf(out, " -> %s", archive_entry_symlink(entry));
 369 }