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/read.c,v 1.40 2008/08/21 06:41:14 kientzle Exp $"); 28 29 #ifdef HAVE_SYS_TYPES_H 30 #include <sys/types.h> 31 #endif 32 #ifdef HAVE_SYS_PARAM_H 33 #include <sys/param.h> 34 #endif 35 #ifdef HAVE_SYS_STAT_H 36 #include <sys/stat.h> 37 #endif 38 39 #ifdef HAVE_ERRNO_H 40 #include <errno.h> 41 #endif 42 #ifdef HAVE_GRP_H 43 #include <grp.h> 44 #endif 45 #ifdef HAVE_LIMITS_H 46 #include <limits.h> 47 #endif 48 #ifdef HAVE_PWD_H 49 #include <pwd.h> 50 #endif 51 #ifdef HAVE_STDINT_H 52 #include <stdint.h> 53 #endif 54 #include <stdio.h> 55 #ifdef HAVE_STDLIB_H 56 #include <stdlib.h> 57 #endif 58 #ifdef HAVE_STRING_H 59 #include <string.h> 60 #endif 61 #ifdef HAVE_TIME_H 62 #include <time.h> 63 #endif 64 #ifdef HAVE_UNISTD_H 65 #include <unistd.h> 66 #endif 67 68 #include "bsdtar.h" 69 #include "err.h" 70 71 struct progress_data { 72 struct bsdtar *bsdtar; 73 struct archive *archive; 74 struct archive_entry *entry; 75 }; 76 77 static void list_item_verbose(struct bsdtar *, FILE *, 78 struct archive_entry *); 79 static void read_archive(struct bsdtar *bsdtar, char mode); 80 81 void 82 tar_mode_t(struct bsdtar *bsdtar) 83 { 84 read_archive(bsdtar, 't'); 85 if (lafe_unmatched_inclusions_warn(bsdtar->matching, "Not found in archive") != 0) 86 bsdtar->return_value = 1; 87 } 88 89 void 90 tar_mode_x(struct bsdtar *bsdtar) 91 { 92 read_archive(bsdtar, 'x'); 93 94 if (lafe_unmatched_inclusions_warn(bsdtar->matching, "Not found in archive") != 0) 95 bsdtar->return_value = 1; 96 } 97 98 static void 99 progress_func(void *cookie) 100 { 101 struct progress_data *progress_data = cookie; 102 struct bsdtar *bsdtar = progress_data->bsdtar; 103 struct archive *a = progress_data->archive; 104 struct archive_entry *entry = progress_data->entry; 105 uint64_t comp, uncomp; 106 107 if (!need_report()) 108 return; 109 110 if (bsdtar->verbose) 111 fprintf(stderr, "\n"); 112 if (a != NULL) { 113 comp = archive_position_compressed(a); 114 uncomp = archive_position_uncompressed(a); 115 fprintf(stderr, 116 "In: %s bytes, compression %d%%;", 117 tar_i64toa(comp), (int)((uncomp - comp) * 100 / uncomp)); 118 fprintf(stderr, " Out: %d files, %s bytes\n", 119 archive_file_count(a), tar_i64toa(uncomp)); 120 } 121 if (entry != NULL) { 122 safe_fprintf(stderr, "Current: %s", 123 archive_entry_pathname(entry)); 124 fprintf(stderr, " (%s bytes)\n", 125 tar_i64toa(archive_entry_size(entry))); 126 } 127 } 128 129 /* 130 * Handle 'x' and 't' modes. 131 */ 132 static void 133 read_archive(struct bsdtar *bsdtar, char mode) 134 { 135 struct progress_data progress_data; 136 FILE *out; 137 struct archive *a; 138 struct archive_entry *entry; 139 const struct stat *st; 140 int r; 141 142 while (*bsdtar->argv) { 143 lafe_include(&bsdtar->matching, *bsdtar->argv); 144 bsdtar->argv++; 145 } 146 147 if (bsdtar->names_from_file != NULL) 148 lafe_include_from_file(&bsdtar->matching, 149 bsdtar->names_from_file, bsdtar->option_null); 150 151 a = archive_read_new(); 152 if (bsdtar->compress_program != NULL) 153 archive_read_support_compression_program(a, bsdtar->compress_program); 154 else 155 archive_read_support_compression_all(a); 156 archive_read_support_format_all(a); 157 if (ARCHIVE_OK != archive_read_set_options(a, bsdtar->option_options)) 158 lafe_errc(1, 0, "%s", archive_error_string(a)); 159 if (archive_read_open_file(a, bsdtar->filename, 160 bsdtar->bytes_per_block != 0 ? bsdtar->bytes_per_block : 161 DEFAULT_BYTES_PER_BLOCK)) 162 lafe_errc(1, 0, "Error opening archive: %s", 163 archive_error_string(a)); 164 165 do_chdir(bsdtar); 166 167 if (mode == 'x') { 168 /* Set an extract callback so that we can handle SIGINFO. */ 169 progress_data.bsdtar = bsdtar; 170 progress_data.archive = a; 171 archive_read_extract_set_progress_callback(a, progress_func, 172 &progress_data); 173 } 174 175 if (mode == 'x' && bsdtar->option_chroot) { 176 #if HAVE_CHROOT 177 if (chroot(".") != 0) 178 lafe_errc(1, errno, "Can't chroot to \".\""); 179 #else 180 lafe_errc(1, 0, 181 "chroot isn't supported on this platform"); 182 #endif 183 } 184 185 for (;;) { 186 /* Support --fast-read option */ 187 if (bsdtar->option_fast_read && 188 lafe_unmatched_inclusions(bsdtar->matching) == 0) 189 break; 190 191 r = archive_read_next_header(a, &entry); 192 progress_data.entry = entry; 193 if (r == ARCHIVE_EOF) 194 break; 195 if (r < ARCHIVE_OK) 196 lafe_warnc(0, "%s", archive_error_string(a)); 197 if (r <= ARCHIVE_WARN) 198 bsdtar->return_value = 1; 199 if (r == ARCHIVE_RETRY) { 200 /* Retryable error: try again */ 201 lafe_warnc(0, "Retrying..."); 202 continue; 203 } 204 if (r == ARCHIVE_FATAL) 205 break; 206 207 if (bsdtar->option_numeric_owner) { 208 archive_entry_set_uname(entry, NULL); 209 archive_entry_set_gname(entry, NULL); 210 } 211 212 /* 213 * Exclude entries that are too old. 214 */ 215 st = archive_entry_stat(entry); 216 if (bsdtar->newer_ctime_sec > 0) { 217 if (st->st_ctime < bsdtar->newer_ctime_sec) 218 continue; /* Too old, skip it. */ 219 if (st->st_ctime == bsdtar->newer_ctime_sec 220 && ARCHIVE_STAT_CTIME_NANOS(st) 221 <= bsdtar->newer_ctime_nsec) 222 continue; /* Too old, skip it. */ 223 } 224 if (bsdtar->newer_mtime_sec > 0) { 225 if (st->st_mtime < bsdtar->newer_mtime_sec) 226 continue; /* Too old, skip it. */ 227 if (st->st_mtime == bsdtar->newer_mtime_sec 228 && ARCHIVE_STAT_MTIME_NANOS(st) 229 <= bsdtar->newer_mtime_nsec) 230 continue; /* Too old, skip it. */ 231 } 232 233 /* 234 * Note that pattern exclusions are checked before 235 * pathname rewrites are handled. This gives more 236 * control over exclusions, since rewrites always lose 237 * information. (For example, consider a rewrite 238 * s/foo[0-9]/foo/. If we check exclusions after the 239 * rewrite, there would be no way to exclude foo1/bar 240 * while allowing foo2/bar.) 241 */ 242 if (lafe_excluded(bsdtar->matching, archive_entry_pathname(entry))) 243 continue; /* Excluded by a pattern test. */ 244 245 if (mode == 't') { 246 /* Perversely, gtar uses -O to mean "send to stderr" 247 * when used with -t. */ 248 out = bsdtar->option_stdout ? stderr : stdout; 249 250 /* 251 * TODO: Provide some reasonable way to 252 * preview rewrites. gtar always displays 253 * the unedited path in -t output, which means 254 * you cannot easily preview rewrites. 255 */ 256 if (bsdtar->verbose < 2) 257 safe_fprintf(out, "%s", 258 archive_entry_pathname(entry)); 259 else 260 list_item_verbose(bsdtar, out, entry); 261 fflush(out); 262 r = archive_read_data_skip(a); 263 if (r == ARCHIVE_WARN) { 264 fprintf(out, "\n"); 265 lafe_warnc(0, "%s", 266 archive_error_string(a)); 267 } 268 if (r == ARCHIVE_RETRY) { 269 fprintf(out, "\n"); 270 lafe_warnc(0, "%s", 271 archive_error_string(a)); 272 } 273 if (r == ARCHIVE_FATAL) { 274 fprintf(out, "\n"); 275 lafe_warnc(0, "%s", 276 archive_error_string(a)); 277 bsdtar->return_value = 1; 278 break; 279 } 280 fprintf(out, "\n"); 281 } else { 282 /* Note: some rewrite failures prevent extraction. */ 283 if (edit_pathname(bsdtar, entry)) 284 continue; /* Excluded by a rewrite failure. */ 285 286 if (bsdtar->option_interactive && 287 !yes("extract '%s'", archive_entry_pathname(entry))) 288 continue; 289 290 /* 291 * Format here is from SUSv2, including the 292 * deferred '\n'. 293 */ 294 if (bsdtar->verbose) { 295 safe_fprintf(stderr, "x %s", 296 archive_entry_pathname(entry)); 297 fflush(stderr); 298 } 299 300 // TODO siginfo_printinfo(bsdtar, 0); 301 302 if (bsdtar->option_stdout) 303 r = archive_read_data_into_fd(a, 1); 304 else 305 r = archive_read_extract(a, entry, 306 bsdtar->extract_flags); 307 if (r != ARCHIVE_OK) { 308 if (!bsdtar->verbose) 309 safe_fprintf(stderr, "%s", 310 archive_entry_pathname(entry)); 311 safe_fprintf(stderr, ": %s", 312 archive_error_string(a)); 313 if (!bsdtar->verbose) 314 fprintf(stderr, "\n"); 315 bsdtar->return_value = 1; 316 } 317 if (bsdtar->verbose) 318 fprintf(stderr, "\n"); 319 if (r == ARCHIVE_FATAL) 320 break; 321 } 322 } 323 324 325 r = archive_read_close(a); 326 if (r != ARCHIVE_OK) 327 lafe_warnc(0, "%s", archive_error_string(a)); 328 if (r <= ARCHIVE_WARN) 329 bsdtar->return_value = 1; 330 331 if (bsdtar->verbose > 2) 332 fprintf(stdout, "Archive Format: %s, Compression: %s\n", 333 archive_format_name(a), archive_compression_name(a)); 334 335 archive_read_finish(a); 336 } 337 338 339 /* 340 * Display information about the current file. 341 * 342 * The format here roughly duplicates the output of 'ls -l'. 343 * This is based on SUSv2, where 'tar tv' is documented as 344 * listing additional information in an "unspecified format," 345 * and 'pax -l' is documented as using the same format as 'ls -l'. 346 */ 347 static void 348 list_item_verbose(struct bsdtar *bsdtar, FILE *out, struct archive_entry *entry) 349 { 350 char tmp[100]; 351 size_t w; 352 const char *p; 353 const char *fmt; 354 time_t tim; 355 static time_t now; 356 357 /* 358 * We avoid collecting the entire list in memory at once by 359 * listing things as we see them. However, that also means we can't 360 * just pre-compute the field widths. Instead, we start with guesses 361 * and just widen them as necessary. These numbers are completely 362 * arbitrary. 363 */ 364 if (!bsdtar->u_width) { 365 bsdtar->u_width = 6; 366 bsdtar->gs_width = 13; 367 } 368 if (!now) 369 time(&now); 370 fprintf(out, "%s %d ", 371 archive_entry_strmode(entry), 372 archive_entry_nlink(entry)); 373 374 /* Use uname if it's present, else uid. */ 375 p = archive_entry_uname(entry); 376 if ((p == NULL) || (*p == '\0')) { 377 sprintf(tmp, "%lu ", 378 (unsigned long)archive_entry_uid(entry)); 379 p = tmp; 380 } 381 w = strlen(p); 382 if (w > bsdtar->u_width) 383 bsdtar->u_width = w; 384 fprintf(out, "%-*s ", (int)bsdtar->u_width, p); 385 386 /* Use gname if it's present, else gid. */ 387 p = archive_entry_gname(entry); 388 if (p != NULL && p[0] != '\0') { 389 fprintf(out, "%s", p); 390 w = strlen(p); 391 } else { 392 sprintf(tmp, "%lu", 393 (unsigned long)archive_entry_gid(entry)); 394 w = strlen(tmp); 395 fprintf(out, "%s", tmp); 396 } 397 398 /* 399 * Print device number or file size, right-aligned so as to make 400 * total width of group and devnum/filesize fields be gs_width. 401 * If gs_width is too small, grow it. 402 */ 403 if (archive_entry_filetype(entry) == AE_IFCHR 404 || archive_entry_filetype(entry) == AE_IFBLK) { 405 sprintf(tmp, "%lu,%lu", 406 (unsigned long)archive_entry_rdevmajor(entry), 407 (unsigned long)archive_entry_rdevminor(entry)); 408 } else { 409 strcpy(tmp, tar_i64toa(archive_entry_size(entry))); 410 } 411 if (w + strlen(tmp) >= bsdtar->gs_width) 412 bsdtar->gs_width = w+strlen(tmp)+1; 413 fprintf(out, "%*s", (int)(bsdtar->gs_width - w), tmp); 414 415 /* Format the time using 'ls -l' conventions. */ 416 tim = archive_entry_mtime(entry); 417 #define HALF_YEAR (time_t)365 * 86400 / 2 418 #if defined(_WIN32) && !defined(__CYGWIN__) 419 #define DAY_FMT "%d" /* Windows' strftime function does not support %e format. */ 420 #else 421 #define DAY_FMT "%e" /* Day number without leading zeros */ 422 #endif 423 if (tim < now - HALF_YEAR || tim > now + HALF_YEAR) 424 fmt = bsdtar->day_first ? DAY_FMT " %b %Y" : "%b " DAY_FMT " %Y"; 425 else 426 fmt = bsdtar->day_first ? DAY_FMT " %b %H:%M" : "%b " DAY_FMT " %H:%M"; 427 strftime(tmp, sizeof(tmp), fmt, localtime(&tim)); 428 fprintf(out, " %s ", tmp); 429 safe_fprintf(out, "%s", archive_entry_pathname(entry)); 430 431 /* Extra information for links. */ 432 if (archive_entry_hardlink(entry)) /* Hard link */ 433 safe_fprintf(out, " link to %s", 434 archive_entry_hardlink(entry)); 435 else if (archive_entry_symlink(entry)) /* Symbolic link */ 436 safe_fprintf(out, " -> %s", archive_entry_symlink(entry)); 437 } 438