1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1992 Keith Muller. 5 * Copyright (c) 1992, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Keith Muller of the University of California, San Diego. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36#include <sys/types.h> 37#include <sys/time.h> 38#include <sys/stat.h> 39#include <signal.h> 40#include <string.h> 41#include <stdio.h> 42#include <fcntl.h> 43#include <errno.h> 44#include <unistd.h> 45#include "pax.h" 46#include "extern.h" 47 48static void wr_archive(ARCHD *, int is_app); 49static int get_arc(void); 50static int next_head(ARCHD *); 51 52/* 53 * Routines which control the overall operation modes of pax as specified by 54 * the user: list, append, read ... 55 */ 56 57static char hdbuf[BLKMULT]; /* space for archive header on read */ 58u_long flcnt; /* number of files processed */ 59 60/* 61 * list() 62 * list the contents of an archive which match user supplied pattern(s) 63 * (no pattern matches all). 64 */ 65 66void 67list(void) 68{ 69 ARCHD *arcn; 70 int res; 71 ARCHD archd; 72 time_t now; 73 74 arcn = &archd; 75 /* 76 * figure out archive type; pass any format specific options to the 77 * archive option processing routine; call the format init routine. We 78 * also save current time for ls_list() so we do not make a system 79 * call for each file we need to print. If verbose (vflag) start up 80 * the name and group caches. 81 */ 82 if ((get_arc() < 0) || ((*frmt->options)() < 0) || 83 ((*frmt->st_rd)() < 0)) 84 return; 85 86 if (vflag && ((uidtb_start() < 0) || (gidtb_start() < 0))) 87 return; 88 89 now = time(NULL); 90 91 /* 92 * step through the archive until the format says it is done 93 */ 94 while (next_head(arcn) == 0) { 95 /* 96 * check for pattern, and user specified options match. 97 * When all patterns are matched we are done. 98 */ 99 if ((res = pat_match(arcn)) < 0) 100 break; 101 102 if ((res == 0) && (sel_chk(arcn) == 0)) { 103 /* 104 * pattern resulted in a selected file 105 */ 106 if (pat_sel(arcn) < 0) 107 break; 108 109 /* 110 * modify the name as requested by the user if name 111 * survives modification, do a listing of the file 112 */ 113 if ((res = mod_name(arcn)) < 0) 114 break; 115 if (res == 0) 116 ls_list(arcn, now, stdout); 117 } 118 119 /* 120 * skip to next archive format header using values calculated 121 * by the format header read routine 122 */ 123 if (rd_skip(arcn->skip + arcn->pad) == 1) 124 break; 125 } 126 127 /* 128 * all done, let format have a chance to cleanup, and make sure that 129 * the patterns supplied by the user were all matched 130 */ 131 (void)(*frmt->end_rd)(); 132 (void)sigprocmask(SIG_BLOCK, &s_mask, NULL); 133 ar_close(); 134 pat_chk(); 135} 136 137/* 138 * extract() 139 * extract the member(s) of an archive as specified by user supplied 140 * pattern(s) (no patterns extracts all members) 141 */ 142 143void 144extract(void) 145{ 146 ARCHD *arcn; 147 int res; 148 off_t cnt; 149 ARCHD archd; 150 struct stat sb; 151 int fd; 152 time_t now; 153 154 arcn = &archd; 155 /* 156 * figure out archive type; pass any format specific options to the 157 * archive option processing routine; call the format init routine; 158 * start up the directory modification time and access mode database 159 */ 160 if ((get_arc() < 0) || ((*frmt->options)() < 0) || 161 ((*frmt->st_rd)() < 0) || (dir_start() < 0)) 162 return; 163 164 /* 165 * When we are doing interactive rename, we store the mapping of names 166 * so we can fix up hard links files later in the archive. 167 */ 168 if (iflag && (name_start() < 0)) 169 return; 170 171 now = time(NULL); 172 173 /* 174 * step through each entry on the archive until the format read routine 175 * says it is done 176 */ 177 while (next_head(arcn) == 0) { 178 179 /* 180 * check for pattern, and user specified options match. When 181 * all the patterns are matched we are done 182 */ 183 if ((res = pat_match(arcn)) < 0) 184 break; 185 186 if ((res > 0) || (sel_chk(arcn) != 0)) { 187 /* 188 * file is not selected. skip past any file data and 189 * padding and go back for the next archive member 190 */ 191 (void)rd_skip(arcn->skip + arcn->pad); 192 continue; 193 } 194 195 /* 196 * with -u or -D only extract when the archive member is newer 197 * than the file with the same name in the file system (no 198 * test of being the same type is required). 199 * NOTE: this test is done BEFORE name modifications as 200 * specified by pax. this operation can be confusing to the 201 * user who might expect the test to be done on an existing 202 * file AFTER the name mod. In honesty the pax spec is probably 203 * flawed in this respect. 204 */ 205 if ((uflag || Dflag) && ((lstat(arcn->name, &sb) == 0))) { 206 if (uflag && Dflag) { 207 if ((arcn->sb.st_mtime <= sb.st_mtime) && 208 (arcn->sb.st_ctime <= sb.st_ctime)) { 209 (void)rd_skip(arcn->skip + arcn->pad); 210 continue; 211 } 212 } else if (Dflag) { 213 if (arcn->sb.st_ctime <= sb.st_ctime) { 214 (void)rd_skip(arcn->skip + arcn->pad); 215 continue; 216 } 217 } else if (arcn->sb.st_mtime <= sb.st_mtime) { 218 (void)rd_skip(arcn->skip + arcn->pad); 219 continue; 220 } 221 } 222 223 /* 224 * this archive member is now been selected. modify the name. 225 */ 226 if ((pat_sel(arcn) < 0) || ((res = mod_name(arcn)) < 0)) 227 break; 228 if (res > 0) { 229 /* 230 * a bad name mod, skip and purge name from link table 231 */ 232 purg_lnk(arcn); 233 (void)rd_skip(arcn->skip + arcn->pad); 234 continue; 235 } 236 237 /* 238 * Non standard -Y and -Z flag. When the existing file is 239 * same age or newer skip 240 */ 241 if ((Yflag || Zflag) && ((lstat(arcn->name, &sb) == 0))) { 242 if (Yflag && Zflag) { 243 if ((arcn->sb.st_mtime <= sb.st_mtime) && 244 (arcn->sb.st_ctime <= sb.st_ctime)) { 245 (void)rd_skip(arcn->skip + arcn->pad); 246 continue; 247 } 248 } else if (Yflag) { 249 if (arcn->sb.st_ctime <= sb.st_ctime) { 250 (void)rd_skip(arcn->skip + arcn->pad); 251 continue; 252 } 253 } else if (arcn->sb.st_mtime <= sb.st_mtime) { 254 (void)rd_skip(arcn->skip + arcn->pad); 255 continue; 256 } 257 } 258 259 if (vflag) { 260 if (vflag > 1) 261 ls_list(arcn, now, listf); 262 else { 263 (void)fputs(arcn->name, listf); 264 vfpart = 1; 265 } 266 } 267 268 /* 269 * if required, chdir around. 270 */ 271 if ((arcn->pat != NULL) && (arcn->pat->chdname != NULL)) 272 if (chdir(arcn->pat->chdname) != 0) 273 syswarn(1, errno, "Cannot chdir to %s", 274 arcn->pat->chdname); 275 276 /* 277 * all ok, extract this member based on type 278 */ 279 if ((arcn->type != PAX_REG) && (arcn->type != PAX_CTG)) { 280 /* 281 * process archive members that are not regular files. 282 * throw out padding and any data that might follow the 283 * header (as determined by the format). 284 */ 285 if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) 286 res = lnk_creat(arcn); 287 else 288 res = node_creat(arcn); 289 290 (void)rd_skip(arcn->skip + arcn->pad); 291 if (res < 0) 292 purg_lnk(arcn); 293 294 if (vflag && vfpart) { 295 (void)putc('\n', listf); 296 vfpart = 0; 297 } 298 continue; 299 } 300 /* 301 * we have a file with data here. If we can not create it, skip 302 * over the data and purge the name from hard link table 303 */ 304 if ((fd = file_creat(arcn)) < 0) { 305 (void)rd_skip(arcn->skip + arcn->pad); 306 purg_lnk(arcn); 307 continue; 308 } 309 /* 310 * extract the file from the archive and skip over padding and 311 * any unprocessed data 312 */ 313 res = (*frmt->rd_data)(arcn, fd, &cnt); 314 file_close(arcn, fd); 315 if (vflag && vfpart) { 316 (void)putc('\n', listf); 317 vfpart = 0; 318 } 319 if (!res) 320 (void)rd_skip(cnt + arcn->pad); 321 322 /* 323 * if required, chdir around. 324 */ 325 if ((arcn->pat != NULL) && (arcn->pat->chdname != NULL)) 326 if (fchdir(cwdfd) != 0) 327 syswarn(1, errno, 328 "Can't fchdir to starting directory"); 329 } 330 331 /* 332 * all done, restore directory modes and times as required; make sure 333 * all patterns supplied by the user were matched; block off signals 334 * to avoid chance for multiple entry into the cleanup code. 335 */ 336 (void)(*frmt->end_rd)(); 337 (void)sigprocmask(SIG_BLOCK, &s_mask, NULL); 338 ar_close(); 339 proc_dir(); 340 pat_chk(); 341} 342 343/* 344 * wr_archive() 345 * Write an archive. used in both creating a new archive and appends on 346 * previously written archive. 347 */ 348 349static void 350wr_archive(ARCHD *arcn, int is_app) 351{ 352 int res; 353 int hlk; 354 int wr_one; 355 off_t cnt; 356 int (*wrf)(ARCHD *); 357 int fd = -1; 358 time_t now; 359 360 /* 361 * if this format supports hard link storage, start up the database 362 * that detects them. 363 */ 364 if (((hlk = frmt->hlk) == 1) && (lnk_start() < 0)) 365 return; 366 367 /* 368 * start up the file traversal code and format specific write 369 */ 370 if ((ftree_start() < 0) || ((*frmt->st_wr)() < 0)) 371 return; 372 wrf = frmt->wr; 373 374 /* 375 * When we are doing interactive rename, we store the mapping of names 376 * so we can fix up hard links files later in the archive. 377 */ 378 if (iflag && (name_start() < 0)) 379 return; 380 381 /* 382 * if this is not append, and there are no files, we do not write a 383 * trailer 384 */ 385 wr_one = is_app; 386 387 now = time(NULL); 388 389 /* 390 * while there are files to archive, process them one at at time 391 */ 392 while (next_file(arcn) == 0) { 393 /* 394 * check if this file meets user specified options match. 395 */ 396 if (sel_chk(arcn) != 0) { 397 ftree_notsel(); 398 continue; 399 } 400 fd = -1; 401 if (uflag) { 402 /* 403 * only archive if this file is newer than a file with 404 * the same name that is already stored on the archive 405 */ 406 if ((res = chk_ftime(arcn)) < 0) 407 break; 408 if (res > 0) 409 continue; 410 } 411 412 /* 413 * this file is considered selected now. see if this is a hard 414 * link to a file already stored 415 */ 416 ftree_sel(arcn); 417 if (hlk && (chk_lnk(arcn) < 0)) 418 break; 419 420 if ((arcn->type == PAX_REG) || (arcn->type == PAX_HRG) || 421 (arcn->type == PAX_CTG)) { 422 /* 423 * we will have to read this file. by opening it now we 424 * can avoid writing a header to the archive for a file 425 * we were later unable to read (we also purge it from 426 * the link table). 427 */ 428 if ((fd = open(arcn->org_name, O_RDONLY, 0)) < 0) { 429 syswarn(1,errno, "Unable to open %s to read", 430 arcn->org_name); 431 purg_lnk(arcn); 432 continue; 433 } 434 } 435 436 /* 437 * Now modify the name as requested by the user 438 */ 439 if ((res = mod_name(arcn)) < 0) { 440 /* 441 * name modification says to skip this file, close the 442 * file and purge link table entry 443 */ 444 rdfile_close(arcn, &fd); 445 purg_lnk(arcn); 446 break; 447 } 448 449 if ((res > 0) || (docrc && (set_crc(arcn, fd) < 0))) { 450 /* 451 * unable to obtain the crc we need, close the file, 452 * purge link table entry 453 */ 454 rdfile_close(arcn, &fd); 455 purg_lnk(arcn); 456 continue; 457 } 458 459 if (vflag) { 460 if (vflag > 1) 461 ls_list(arcn, now, listf); 462 else { 463 (void)fputs(arcn->name, listf); 464 vfpart = 1; 465 } 466 } 467 ++flcnt; 468 469 /* 470 * looks safe to store the file, have the format specific 471 * routine write routine store the file header on the archive 472 */ 473 if ((res = (*wrf)(arcn)) < 0) { 474 rdfile_close(arcn, &fd); 475 break; 476 } 477 wr_one = 1; 478 if (res > 0) { 479 /* 480 * format write says no file data needs to be stored 481 * so we are done messing with this file 482 */ 483 if (vflag && vfpart) { 484 (void)putc('\n', listf); 485 vfpart = 0; 486 } 487 rdfile_close(arcn, &fd); 488 continue; 489 } 490 491 /* 492 * Add file data to the archive, quit on write error. if we 493 * cannot write the entire file contents to the archive we 494 * must pad the archive to replace the missing file data 495 * (otherwise during an extract the file header for the file 496 * which FOLLOWS this one will not be where we expect it to 497 * be). 498 */ 499 res = (*frmt->wr_data)(arcn, fd, &cnt); 500 rdfile_close(arcn, &fd); 501 if (vflag && vfpart) { 502 (void)putc('\n', listf); 503 vfpart = 0; 504 } 505 if (res < 0) 506 break; 507 508 /* 509 * pad as required, cnt is number of bytes not written 510 */ 511 if (((cnt > 0) && (wr_skip(cnt) < 0)) || 512 ((arcn->pad > 0) && (wr_skip(arcn->pad) < 0))) 513 break; 514 } 515 516 /* 517 * tell format to write trailer; pad to block boundary; reset directory 518 * mode/access times, and check if all patterns supplied by the user 519 * were matched. block off signals to avoid chance for multiple entry 520 * into the cleanup code 521 */ 522 if (wr_one) { 523 (*frmt->end_wr)(); 524 wr_fin(); 525 } 526 (void)sigprocmask(SIG_BLOCK, &s_mask, NULL); 527 ar_close(); 528 if (tflag) 529 proc_dir(); 530 ftree_chk(); 531} 532 533/* 534 * append() 535 * Add file to previously written archive. Archive format specified by the 536 * user must agree with archive. The archive is read first to collect 537 * modification times (if -u) and locate the archive trailer. The archive 538 * is positioned in front of the record with the trailer and wr_archive() 539 * is called to add the new members. 540 * PAX IMPLEMENTATION DETAIL NOTE: 541 * -u is implemented by adding the new members to the end of the archive. 542 * Care is taken so that these do not end up as links to the older 543 * version of the same file already stored in the archive. It is expected 544 * when extraction occurs these newer versions will over-write the older 545 * ones stored "earlier" in the archive (this may be a bad assumption as 546 * it depends on the implementation of the program doing the extraction). 547 * It is really difficult to splice in members without either re-writing 548 * the entire archive (from the point were the old version was), or having 549 * assistance of the format specification in terms of a special update 550 * header that invalidates a previous archive record. The POSIX spec left 551 * the method used to implement -u unspecified. This pax is able to 552 * over write existing files that it creates. 553 */ 554 555void 556append(void) 557{ 558 ARCHD *arcn; 559 int res; 560 ARCHD archd; 561 FSUB *orgfrmt; 562 int udev; 563 off_t tlen; 564 565 arcn = &archd; 566 orgfrmt = frmt; 567 568 /* 569 * Do not allow an append operation if the actual archive is of a 570 * different format than the user specified format. 571 */ 572 if (get_arc() < 0) 573 return; 574 if ((orgfrmt != NULL) && (orgfrmt != frmt)) { 575 paxwarn(1, "Cannot mix current archive format %s with %s", 576 frmt->name, orgfrmt->name); 577 return; 578 } 579 580 /* 581 * pass the format any options and start up format 582 */ 583 if (((*frmt->options)() < 0) || ((*frmt->st_rd)() < 0)) 584 return; 585 586 /* 587 * if we only are adding members that are newer, we need to save the 588 * mod times for all files we see. 589 */ 590 if (uflag && (ftime_start() < 0)) 591 return; 592 593 /* 594 * some archive formats encode hard links by recording the device and 595 * file serial number (inode) but copy the file anyway (multiple times) 596 * to the archive. When we append, we run the risk that newly added 597 * files may have the same device and inode numbers as those recorded 598 * on the archive but during a previous run. If this happens, when the 599 * archive is extracted we get INCORRECT hard links. We avoid this by 600 * remapping the device numbers so that newly added files will never 601 * use the same device number as one found on the archive. remapping 602 * allows new members to safely have links among themselves. remapping 603 * also avoids problems with file inode (serial number) truncations 604 * when the inode number is larger than storage space in the archive 605 * header. See the remap routines for more details. 606 */ 607 if ((udev = frmt->udev) && (dev_start() < 0)) 608 return; 609 610 /* 611 * reading the archive may take a long time. If verbose tell the user 612 */ 613 if (vflag) { 614 (void)fprintf(listf, 615 "%s: Reading archive to position at the end...", argv0); 616 vfpart = 1; 617 } 618 619 /* 620 * step through the archive until the format says it is done 621 */ 622 while (next_head(arcn) == 0) { 623 /* 624 * check if this file meets user specified options. 625 */ 626 if (sel_chk(arcn) != 0) { 627 if (rd_skip(arcn->skip + arcn->pad) == 1) 628 break; 629 continue; 630 } 631 632 if (uflag) { 633 /* 634 * see if this is the newest version of this file has 635 * already been seen, if so skip. 636 */ 637 if ((res = chk_ftime(arcn)) < 0) 638 break; 639 if (res > 0) { 640 if (rd_skip(arcn->skip + arcn->pad) == 1) 641 break; 642 continue; 643 } 644 } 645 646 /* 647 * Store this device number. Device numbers seen during the 648 * read phase of append will cause newly appended files with a 649 * device number seen in the old part of the archive to be 650 * remapped to an unused device number. 651 */ 652 if ((udev && (add_dev(arcn) < 0)) || 653 (rd_skip(arcn->skip + arcn->pad) == 1)) 654 break; 655 } 656 657 /* 658 * done, finish up read and get the number of bytes to back up so we 659 * can add new members. The format might have used the hard link table, 660 * purge it. 661 */ 662 tlen = (*frmt->end_rd)(); 663 lnk_end(); 664 665 /* 666 * try to position for write, if this fails quit. if any error occurs, 667 * we will refuse to write 668 */ 669 if (appnd_start(tlen) < 0) 670 return; 671 672 /* 673 * tell the user we are done reading. 674 */ 675 if (vflag && vfpart) { 676 (void)fputs("done.\n", listf); 677 vfpart = 0; 678 } 679 680 /* 681 * go to the writing phase to add the new members 682 */ 683 wr_archive(arcn, 1); 684} 685 686/* 687 * archive() 688 * write a new archive 689 */ 690 691void 692archive(void) 693{ 694 ARCHD archd; 695 696 /* 697 * if we only are adding members that are newer, we need to save the 698 * mod times for all files; set up for writing; pass the format any 699 * options write the archive 700 */ 701 if ((uflag && (ftime_start() < 0)) || (wr_start() < 0)) 702 return; 703 if ((*frmt->options)() < 0) 704 return; 705 706 wr_archive(&archd, 0); 707} 708 709/* 710 * copy() 711 * copy files from one part of the file system to another. this does not 712 * use any archive storage. The EFFECT OF THE COPY IS THE SAME as if an 713 * archive was written and then extracted in the destination directory 714 * (except the files are forced to be under the destination directory). 715 */ 716 717void 718copy(void) 719{ 720 ARCHD *arcn; 721 int res; 722 int fddest; 723 char *dest_pt; 724 int dlen; 725 int drem; 726 int fdsrc = -1; 727 struct stat sb; 728 ARCHD archd; 729 char dirbuf[PAXPATHLEN+1]; 730 731 arcn = &archd; 732 /* 733 * set up the destination dir path and make sure it is a directory. We 734 * make sure we have a trailing / on the destination 735 */ 736 dlen = l_strncpy(dirbuf, dirptr, sizeof(dirbuf) - 1); 737 dest_pt = dirbuf + dlen; 738 if (*(dest_pt-1) != '/') { 739 *dest_pt++ = '/'; 740 ++dlen; 741 } 742 *dest_pt = '\0'; 743 drem = PAXPATHLEN - dlen; 744 745 if (stat(dirptr, &sb) < 0) { 746 syswarn(1, errno, "Cannot access destination directory %s", 747 dirptr); 748 return; 749 } 750 if (!S_ISDIR(sb.st_mode)) { 751 paxwarn(1, "Destination is not a directory %s", dirptr); 752 return; 753 } 754 755 /* 756 * start up the hard link table; file traversal routines and the 757 * modification time and access mode database 758 */ 759 if ((lnk_start() < 0) || (ftree_start() < 0) || (dir_start() < 0)) 760 return; 761 762 /* 763 * When we are doing interactive rename, we store the mapping of names 764 * so we can fix up hard links files later in the archive. 765 */ 766 if (iflag && (name_start() < 0)) 767 return; 768 769 /* 770 * set up to cp file trees 771 */ 772 cp_start(); 773 774 /* 775 * while there are files to archive, process them 776 */ 777 while (next_file(arcn) == 0) { 778 fdsrc = -1; 779 780 /* 781 * check if this file meets user specified options 782 */ 783 if (sel_chk(arcn) != 0) { 784 ftree_notsel(); 785 continue; 786 } 787 788 /* 789 * if there is already a file in the destination directory with 790 * the same name and it is newer, skip the one stored on the 791 * archive. 792 * NOTE: this test is done BEFORE name modifications as 793 * specified by pax. this can be confusing to the user who 794 * might expect the test to be done on an existing file AFTER 795 * the name mod. In honesty the pax spec is probably flawed in 796 * this respect 797 */ 798 if (uflag || Dflag) { 799 /* 800 * create the destination name 801 */ 802 if (*(arcn->name) == '/') 803 res = 1; 804 else 805 res = 0; 806 if ((arcn->nlen - res) > drem) { 807 paxwarn(1, "Destination pathname too long %s", 808 arcn->name); 809 continue; 810 } 811 (void)strncpy(dest_pt, arcn->name + res, drem); 812 dirbuf[PAXPATHLEN] = '\0'; 813 814 /* 815 * if existing file is same age or newer skip 816 */ 817 res = lstat(dirbuf, &sb); 818 *dest_pt = '\0'; 819 820 if (res == 0) { 821 if (uflag && Dflag) { 822 if ((arcn->sb.st_mtime<=sb.st_mtime) && 823 (arcn->sb.st_ctime<=sb.st_ctime)) 824 continue; 825 } else if (Dflag) { 826 if (arcn->sb.st_ctime <= sb.st_ctime) 827 continue; 828 } else if (arcn->sb.st_mtime <= sb.st_mtime) 829 continue; 830 } 831 } 832 833 /* 834 * this file is considered selected. See if this is a hard link 835 * to a previous file; modify the name as requested by the 836 * user; set the final destination. 837 */ 838 ftree_sel(arcn); 839 if ((chk_lnk(arcn) < 0) || ((res = mod_name(arcn)) < 0)) 840 break; 841 if ((res > 0) || (set_dest(arcn, dirbuf, dlen) < 0)) { 842 /* 843 * skip file, purge from link table 844 */ 845 purg_lnk(arcn); 846 continue; 847 } 848 849 /* 850 * Non standard -Y and -Z flag. When the existing file is 851 * same age or newer skip 852 */ 853 if ((Yflag || Zflag) && ((lstat(arcn->name, &sb) == 0))) { 854 if (Yflag && Zflag) { 855 if ((arcn->sb.st_mtime <= sb.st_mtime) && 856 (arcn->sb.st_ctime <= sb.st_ctime)) 857 continue; 858 } else if (Yflag) { 859 if (arcn->sb.st_ctime <= sb.st_ctime) 860 continue; 861 } else if (arcn->sb.st_mtime <= sb.st_mtime) 862 continue; 863 } 864 865 if (vflag) { 866 (void)fputs(arcn->name, listf); 867 vfpart = 1; 868 } 869 ++flcnt; 870 871 /* 872 * try to create a hard link to the src file if requested 873 * but make sure we are not trying to overwrite ourselves. 874 */ 875 if (lflag) 876 res = cross_lnk(arcn); 877 else 878 res = chk_same(arcn); 879 if (res <= 0) { 880 if (vflag && vfpart) { 881 (void)putc('\n', listf); 882 vfpart = 0; 883 } 884 continue; 885 } 886 887 /* 888 * have to create a new file 889 */ 890 if ((arcn->type != PAX_REG) && (arcn->type != PAX_CTG)) { 891 /* 892 * create a link or special file 893 */ 894 if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) 895 res = lnk_creat(arcn); 896 else 897 res = node_creat(arcn); 898 if (res < 0) 899 purg_lnk(arcn); 900 if (vflag && vfpart) { 901 (void)putc('\n', listf); 902 vfpart = 0; 903 } 904 continue; 905 } 906 907 /* 908 * have to copy a regular file to the destination directory. 909 * first open source file and then create the destination file 910 */ 911 if ((fdsrc = open(arcn->org_name, O_RDONLY, 0)) < 0) { 912 syswarn(1, errno, "Unable to open %s to read", 913 arcn->org_name); 914 purg_lnk(arcn); 915 continue; 916 } 917 if ((fddest = file_creat(arcn)) < 0) { 918 rdfile_close(arcn, &fdsrc); 919 purg_lnk(arcn); 920 continue; 921 } 922 923 /* 924 * copy source file data to the destination file 925 */ 926 cp_file(arcn, fdsrc, fddest); 927 file_close(arcn, fddest); 928 rdfile_close(arcn, &fdsrc); 929 930 if (vflag && vfpart) { 931 (void)putc('\n', listf); 932 vfpart = 0; 933 } 934 } 935 936 /* 937 * restore directory modes and times as required; make sure all 938 * patterns were selected block off signals to avoid chance for 939 * multiple entry into the cleanup code. 940 */ 941 (void)sigprocmask(SIG_BLOCK, &s_mask, NULL); 942 ar_close(); 943 proc_dir(); 944 ftree_chk(); 945} 946 947/* 948 * next_head() 949 * try to find a valid header in the archive. Uses format specific 950 * routines to extract the header and id the trailer. Trailers may be 951 * located within a valid header or in an invalid header (the location 952 * is format specific. The inhead field from the option table tells us 953 * where to look for the trailer). 954 * We keep reading (and resyncing) until we get enough contiguous data 955 * to check for a header. If we cannot find one, we shift by a byte 956 * add a new byte from the archive to the end of the buffer and try again. 957 * If we get a read error, we throw out what we have (as we must have 958 * contiguous data) and start over again. 959 * ASSUMED: headers fit within a BLKMULT header. 960 * Return: 961 * 0 if we got a header, -1 if we are unable to ever find another one 962 * (we reached the end of input, or we reached the limit on retries. see 963 * the specs for rd_wrbuf() for more details) 964 */ 965 966static int 967next_head(ARCHD *arcn) 968{ 969 int ret; 970 char *hdend; 971 int res; 972 int shftsz; 973 int hsz; 974 int in_resync = 0; /* set when we are in resync mode */ 975 int cnt = 0; /* counter for trailer function */ 976 int first = 1; /* on 1st read, EOF isn't premature. */ 977 978 /* 979 * set up initial conditions, we want a whole frmt->hsz block as we 980 * have no data yet. 981 */ 982 res = hsz = frmt->hsz; 983 hdend = hdbuf; 984 shftsz = hsz - 1; 985 for(;;) { 986 /* 987 * keep looping until we get a contiguous FULL buffer 988 * (frmt->hsz is the proper size) 989 */ 990 for (;;) { 991 if ((ret = rd_wrbuf(hdend, res)) == res) 992 break; 993 994 /* 995 * If we read 0 bytes (EOF) from an archive when we 996 * expect to find a header, we have stepped upon 997 * an archive without the customary block of zeroes 998 * end marker. It's just stupid to error out on 999 * them, so exit gracefully. 1000 */ 1001 if (first && ret == 0) 1002 return(-1); 1003 first = 0; 1004 1005 /* 1006 * some kind of archive read problem, try to resync the 1007 * storage device, better give the user the bad news. 1008 */ 1009 if ((ret == 0) || (rd_sync() < 0)) { 1010 paxwarn(1,"Premature end of file on archive read"); 1011 return(-1); 1012 } 1013 if (!in_resync) { 1014 if (act == APPND) { 1015 paxwarn(1, 1016 "Archive I/O error, cannot continue"); 1017 return(-1); 1018 } 1019 paxwarn(1,"Archive I/O error. Trying to recover."); 1020 ++in_resync; 1021 } 1022 1023 /* 1024 * oh well, throw it all out and start over 1025 */ 1026 res = hsz; 1027 hdend = hdbuf; 1028 } 1029 1030 /* 1031 * ok we have a contiguous buffer of the right size. Call the 1032 * format read routine. If this was not a valid header and this 1033 * format stores trailers outside of the header, call the 1034 * format specific trailer routine to check for a trailer. We 1035 * have to watch out that we do not mis-identify file data or 1036 * block padding as a header or trailer. Format specific 1037 * trailer functions must NOT check for the trailer while we 1038 * are running in resync mode. Some trailer functions may tell 1039 * us that this block cannot contain a valid header either, so 1040 * we then throw out the entire block and start over. 1041 */ 1042 if ((*frmt->rd)(arcn, hdbuf) == 0) 1043 break; 1044 1045 if (!frmt->inhead) { 1046 /* 1047 * this format has trailers outside of valid headers 1048 */ 1049 if ((ret = (*frmt->trail_tar)(hdbuf,in_resync,&cnt)) == 0){ 1050 /* 1051 * valid trailer found, drain input as required 1052 */ 1053 ar_drain(); 1054 return(-1); 1055 } 1056 1057 if (ret == 1) { 1058 /* 1059 * we are in resync and we were told to throw 1060 * the whole block out because none of the 1061 * bytes in this block can be used to form a 1062 * valid header 1063 */ 1064 res = hsz; 1065 hdend = hdbuf; 1066 continue; 1067 } 1068 } 1069 1070 /* 1071 * Brute force section. 1072 * not a valid header. We may be able to find a header yet. So 1073 * we shift over by one byte, and set up to read one byte at a 1074 * time from the archive and place it at the end of the buffer. 1075 * We will keep moving byte at a time until we find a header or 1076 * get a read error and have to start over. 1077 */ 1078 if (!in_resync) { 1079 if (act == APPND) { 1080 paxwarn(1,"Unable to append, archive header flaw"); 1081 return(-1); 1082 } 1083 paxwarn(1,"Invalid header, starting valid header search."); 1084 ++in_resync; 1085 } 1086 memmove(hdbuf, hdbuf+1, shftsz); 1087 res = 1; 1088 hdend = hdbuf + shftsz; 1089 } 1090 1091 /* 1092 * ok got a valid header, check for trailer if format encodes it in 1093 * the header. 1094 */ 1095 if (frmt->inhead && ((*frmt->trail_cpio)(arcn) == 0)) { 1096 /* 1097 * valid trailer found, drain input as required 1098 */ 1099 ar_drain(); 1100 return(-1); 1101 } 1102 1103 ++flcnt; 1104 return(0); 1105} 1106 1107/* 1108 * get_arc() 1109 * Figure out what format an archive is. Handles archive with flaws by 1110 * brute force searches for a legal header in any supported format. The 1111 * format id routines have to be careful to NOT mis-identify a format. 1112 * ASSUMED: headers fit within a BLKMULT header. 1113 * Return: 1114 * 0 if archive found -1 otherwise 1115 */ 1116 1117static int 1118get_arc(void) 1119{ 1120 int i; 1121 int hdsz = 0; 1122 int res; 1123 int minhd = BLKMULT; 1124 char *hdend; 1125 int notice = 0; 1126 1127 /* 1128 * find the smallest header size in all archive formats and then set up 1129 * to read the archive. 1130 */ 1131 for (i = 0; ford[i] >= 0; ++i) { 1132 if (fsub[ford[i]].hsz < minhd) 1133 minhd = fsub[ford[i]].hsz; 1134 } 1135 if (rd_start() < 0) 1136 return(-1); 1137 res = BLKMULT; 1138 hdsz = 0; 1139 hdend = hdbuf; 1140 for(;;) { 1141 for (;;) { 1142 /* 1143 * fill the buffer with at least the smallest header 1144 */ 1145 i = rd_wrbuf(hdend, res); 1146 if (i > 0) 1147 hdsz += i; 1148 if (hdsz >= minhd) 1149 break; 1150 1151 /* 1152 * if we cannot recover from a read error quit 1153 */ 1154 if ((i == 0) || (rd_sync() < 0)) 1155 goto out; 1156 1157 /* 1158 * when we get an error none of the data we already 1159 * have can be used to create a legal header (we just 1160 * got an error in the middle), so we throw it all out 1161 * and refill the buffer with fresh data. 1162 */ 1163 res = BLKMULT; 1164 hdsz = 0; 1165 hdend = hdbuf; 1166 if (!notice) { 1167 if (act == APPND) 1168 return(-1); 1169 paxwarn(1,"Cannot identify format. Searching..."); 1170 ++notice; 1171 } 1172 } 1173 1174 /* 1175 * we have at least the size of the smallest header in any 1176 * archive format. Look to see if we have a match. The array 1177 * ford[] is used to specify the header id order to reduce the 1178 * chance of incorrectly id'ing a valid header (some formats 1179 * may be subsets of each other and the order would then be 1180 * important). 1181 */ 1182 for (i = 0; ford[i] >= 0; ++i) { 1183 if ((*fsub[ford[i]].id)(hdbuf, hdsz) < 0) 1184 continue; 1185 frmt = &(fsub[ford[i]]); 1186 /* 1187 * yuck, to avoid slow special case code in the extract 1188 * routines, just push this header back as if it was 1189 * not seen. We have left extra space at start of the 1190 * buffer for this purpose. This is a bit ugly, but 1191 * adding all the special case code is far worse. 1192 */ 1193 pback(hdbuf, hdsz); 1194 return(0); 1195 } 1196 1197 /* 1198 * We have a flawed archive, no match. we start searching, but 1199 * we never allow additions to flawed archives 1200 */ 1201 if (!notice) { 1202 if (act == APPND) 1203 return(-1); 1204 paxwarn(1, "Cannot identify format. Searching..."); 1205 ++notice; 1206 } 1207 1208 /* 1209 * brute force search for a header that we can id. 1210 * we shift through byte at a time. this is slow, but we cannot 1211 * determine the nature of the flaw in the archive in a 1212 * portable manner 1213 */ 1214 if (--hdsz > 0) { 1215 memmove(hdbuf, hdbuf+1, hdsz); 1216 res = BLKMULT - hdsz; 1217 hdend = hdbuf + hdsz; 1218 } else { 1219 res = BLKMULT; 1220 hdend = hdbuf; 1221 hdsz = 0; 1222 } 1223 } 1224 1225 out: 1226 /* 1227 * we cannot find a header, bow, apologize and quit 1228 */ 1229 paxwarn(1, "Sorry, unable to determine archive format."); 1230 return(-1); 1231} 1232