1 /*- 2 * Copyright (c) 1992 Keith Muller. 3 * Copyright (c) 1992, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * This code is derived from software contributed to Berkeley by 7 * Keith Muller of the University of California, San Diego. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by the University of 20 * California, Berkeley and its contributors. 21 * 4. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38 #ifndef lint 39 #if 0 40 static char sccsid[] = "@(#)ar_subs.c 8.2 (Berkeley) 4/18/94"; 41 #endif 42 static const char rcsid[] = 43 "$FreeBSD$"; 44 #endif /* not lint */ 45 46 #include <sys/types.h> 47 #include <sys/time.h> 48 #include <sys/stat.h> 49 #include <signal.h> 50 #include <string.h> 51 #include <stdio.h> 52 #include <fcntl.h> 53 #include <errno.h> 54 #include <unistd.h> 55 #include <stdlib.h> 56 #include "pax.h" 57 #include "extern.h" 58 59 static void wr_archive __P((register ARCHD *, int is_app)); 60 static int get_arc __P((void)); 61 static int next_head __P((register ARCHD *)); 62 extern sigset_t s_mask; 63 64 /* 65 * Routines which control the overall operation modes of pax as specified by 66 * the user: list, append, read ... 67 */ 68 69 static char hdbuf[BLKMULT]; /* space for archive header on read */ 70 u_long flcnt; /* number of files processed */ 71 72 /* 73 * list() 74 * list the contents of an archive which match user supplied pattern(s) 75 * (no pattern matches all). 76 */ 77 78 #if __STDC__ 79 void 80 list(void) 81 #else 82 void 83 list() 84 #endif 85 { 86 register ARCHD *arcn; 87 register int res; 88 ARCHD archd; 89 time_t now; 90 91 arcn = &archd; 92 /* 93 * figure out archive type; pass any format specific options to the 94 * archive option processing routine; call the format init routine. We 95 * also save current time for ls_list() so we do not make a system 96 * call for each file we need to print. If verbose (vflag) start up 97 * the name and group caches. 98 */ 99 if ((get_arc() < 0) || ((*frmt->options)() < 0) || 100 ((*frmt->st_rd)() < 0)) 101 return; 102 103 if (vflag && ((uidtb_start() < 0) || (gidtb_start() < 0))) 104 return; 105 106 now = time((time_t *)NULL); 107 108 /* 109 * step through the archive until the format says it is done 110 */ 111 while (next_head(arcn) == 0) { 112 /* 113 * check for pattern, and user specified options match. 114 * When all patterns are matched we are done. 115 */ 116 if ((res = pat_match(arcn)) < 0) 117 break; 118 119 if ((res == 0) && (sel_chk(arcn) == 0)) { 120 /* 121 * pattern resulted in a selected file 122 */ 123 if (pat_sel(arcn) < 0) 124 break; 125 126 /* 127 * modify the name as requested by the user if name 128 * survives modification, do a listing of the file 129 */ 130 if ((res = mod_name(arcn)) < 0) 131 break; 132 if (res == 0) 133 ls_list(arcn, now); 134 } 135 136 /* 137 * skip to next archive format header using values calculated 138 * by the format header read routine 139 */ 140 if (rd_skip(arcn->skip + arcn->pad) == 1) 141 break; 142 } 143 144 /* 145 * all done, let format have a chance to cleanup, and make sure that 146 * the patterns supplied by the user were all matched 147 */ 148 (void)(*frmt->end_rd)(); 149 (void)sigprocmask(SIG_BLOCK, &s_mask, (sigset_t *)NULL); 150 ar_close(); 151 pat_chk(); 152 } 153 154 /* 155 * extract() 156 * extract the member(s) of an archive as specified by user supplied 157 * pattern(s) (no patterns extracts all members) 158 */ 159 160 #if __STDC__ 161 void 162 extract(void) 163 #else 164 void 165 extract() 166 #endif 167 { 168 register ARCHD *arcn; 169 register int res; 170 off_t cnt; 171 ARCHD archd; 172 struct stat sb; 173 int fd; 174 175 arcn = &archd; 176 /* 177 * figure out archive type; pass any format specific options to the 178 * archive option processing routine; call the format init routine; 179 * start up the directory modification time and access mode database 180 */ 181 if ((get_arc() < 0) || ((*frmt->options)() < 0) || 182 ((*frmt->st_rd)() < 0) || (dir_start() < 0)) 183 return; 184 185 /* 186 * When we are doing interactive rename, we store the mapping of names 187 * so we can fix up hard links files later in the archive. 188 */ 189 if (iflag && (name_start() < 0)) 190 return; 191 192 /* 193 * step through each entry on the archive until the format read routine 194 * says it is done 195 */ 196 while (next_head(arcn) == 0) { 197 198 /* 199 * check for pattern, and user specified options match. When 200 * all the patterns are matched we are done 201 */ 202 if ((res = pat_match(arcn)) < 0) 203 break; 204 205 if ((res > 0) || (sel_chk(arcn) != 0)) { 206 /* 207 * file is not selected. skip past any file data and 208 * padding and go back for the next archive member 209 */ 210 (void)rd_skip(arcn->skip + arcn->pad); 211 continue; 212 } 213 214 /* 215 * with -u or -D only extract when the archive member is newer 216 * than the file with the same name in the file system (nos 217 * test of being the same type is required). 218 * NOTE: this test is done BEFORE name modifications as 219 * specified by pax. this operation can be confusing to the 220 * user who might expect the test to be done on an existing 221 * file AFTER the name mod. In honesty the pax spec is probably 222 * flawed in this respect. 223 */ 224 if ((uflag || Dflag) && ((lstat(arcn->name, &sb) == 0))) { 225 if (uflag && Dflag) { 226 if ((arcn->sb.st_mtime <= sb.st_mtime) && 227 (arcn->sb.st_ctime <= sb.st_ctime)) { 228 (void)rd_skip(arcn->skip + arcn->pad); 229 continue; 230 } 231 } else if (Dflag) { 232 if (arcn->sb.st_ctime <= sb.st_ctime) { 233 (void)rd_skip(arcn->skip + arcn->pad); 234 continue; 235 } 236 } else if (arcn->sb.st_mtime <= sb.st_mtime) { 237 (void)rd_skip(arcn->skip + arcn->pad); 238 continue; 239 } 240 } 241 242 /* 243 * this archive member is now been selected. modify the name. 244 */ 245 if ((pat_sel(arcn) < 0) || ((res = mod_name(arcn)) < 0)) 246 break; 247 if (res > 0) { 248 /* 249 * a bad name mod, skip and purge name from link table 250 */ 251 purg_lnk(arcn); 252 (void)rd_skip(arcn->skip + arcn->pad); 253 continue; 254 } 255 256 /* 257 * Non standard -Y and -Z flag. When the existing file is 258 * same age or newer skip 259 */ 260 if ((Yflag || Zflag) && ((lstat(arcn->name, &sb) == 0))) { 261 if (Yflag && Zflag) { 262 if ((arcn->sb.st_mtime <= sb.st_mtime) && 263 (arcn->sb.st_ctime <= sb.st_ctime)) { 264 (void)rd_skip(arcn->skip + arcn->pad); 265 continue; 266 } 267 } else if (Yflag) { 268 if (arcn->sb.st_ctime <= sb.st_ctime) { 269 (void)rd_skip(arcn->skip + arcn->pad); 270 continue; 271 } 272 } else if (arcn->sb.st_mtime <= sb.st_mtime) { 273 (void)rd_skip(arcn->skip + arcn->pad); 274 continue; 275 } 276 } 277 278 if (vflag) { 279 (void)fputs(arcn->name, stderr); 280 vfpart = 1; 281 } 282 283 /* 284 * all ok, extract this member based on type 285 */ 286 if ((arcn->type != PAX_REG) && (arcn->type != PAX_CTG)) { 287 /* 288 * process archive members that are not regular files. 289 * throw out padding and any data that might follow the 290 * header (as determined by the format). 291 */ 292 if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) 293 res = lnk_creat(arcn); 294 else 295 res = node_creat(arcn); 296 297 (void)rd_skip(arcn->skip + arcn->pad); 298 if (res < 0) 299 purg_lnk(arcn); 300 301 if (vflag && vfpart) { 302 (void)putc('\n', stderr); 303 vfpart = 0; 304 } 305 continue; 306 } 307 /* 308 * we have a file with data here. If we can not create it, skip 309 * over the data and purge the name from hard link table 310 */ 311 if ((fd = file_creat(arcn)) < 0) { 312 (void)rd_skip(arcn->skip + arcn->pad); 313 purg_lnk(arcn); 314 continue; 315 } 316 /* 317 * extract the file from the archive and skip over padding and 318 * any unprocessed data 319 */ 320 res = (*frmt->rd_data)(arcn, fd, &cnt); 321 file_close(arcn, fd); 322 if (vflag && vfpart) { 323 (void)putc('\n', stderr); 324 vfpart = 0; 325 } 326 if (!res) 327 (void)rd_skip(cnt + arcn->pad); 328 } 329 330 /* 331 * all done, restore directory modes and times as required; make sure 332 * all patterns supplied by the user were matched; block off signals 333 * to avoid chance for multiple entry into the cleanup code. 334 */ 335 (void)(*frmt->end_rd)(); 336 (void)sigprocmask(SIG_BLOCK, &s_mask, (sigset_t *)NULL); 337 ar_close(); 338 proc_dir(); 339 pat_chk(); 340 } 341 342 /* 343 * wr_archive() 344 * Write an archive. used in both creating a new archive and appends on 345 * previously written archive. 346 */ 347 348 #if __STDC__ 349 static void 350 wr_archive(register ARCHD *arcn, int is_app) 351 #else 352 static void 353 wr_archive(arcn, is_app) 354 register ARCHD *arcn; 355 int is_app; 356 #endif 357 { 358 register int res; 359 register int hlk; 360 register int wr_one; 361 off_t cnt; 362 int (*wrf)(); 363 int fd = -1; 364 365 /* 366 * if this format supports hard link storage, start up the database 367 * that detects them. 368 */ 369 if (((hlk = frmt->hlk) == 1) && (lnk_start() < 0)) 370 return; 371 372 /* 373 * start up the file traversal code and format specific write 374 */ 375 if ((ftree_start() < 0) || ((*frmt->st_wr)() < 0)) 376 return; 377 wrf = frmt->wr; 378 379 /* 380 * When we are doing interactive rename, we store the mapping of names 381 * so we can fix up hard links files later in the archive. 382 */ 383 if (iflag && (name_start() < 0)) 384 return; 385 386 /* 387 * if this not append, and there are no files, we do no write a trailer 388 */ 389 wr_one = is_app; 390 391 /* 392 * while there are files to archive, process them one at at time 393 */ 394 while (next_file(arcn) == 0) { 395 /* 396 * check if this file meets user specified options match. 397 */ 398 if (sel_chk(arcn) != 0) 399 continue; 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 sys_warn(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 (void)fputs(arcn->name, stderr); 461 vfpart = 1; 462 } 463 ++flcnt; 464 465 /* 466 * looks safe to store the file, have the format specific 467 * routine write routine store the file header on the archive 468 */ 469 if ((res = (*wrf)(arcn)) < 0) { 470 rdfile_close(arcn, &fd); 471 break; 472 } 473 wr_one = 1; 474 if (res > 0) { 475 /* 476 * format write says no file data needs to be stored 477 * so we are done messing with this file 478 */ 479 if (vflag && vfpart) { 480 (void)putc('\n', stderr); 481 vfpart = 0; 482 } 483 rdfile_close(arcn, &fd); 484 continue; 485 } 486 487 /* 488 * Add file data to the archive, quit on write error. if we 489 * cannot write the entire file contents to the archive we 490 * must pad the archive to replace the missing file data 491 * (otherwise during an extract the file header for the file 492 * which FOLLOWS this one will not be where we expect it to 493 * be). 494 */ 495 res = (*frmt->wr_data)(arcn, fd, &cnt); 496 rdfile_close(arcn, &fd); 497 if (vflag && vfpart) { 498 (void)putc('\n', stderr); 499 vfpart = 0; 500 } 501 if (res < 0) 502 break; 503 504 /* 505 * pad as required, cnt is number of bytes not written 506 */ 507 if (((cnt > 0) && (wr_skip(cnt) < 0)) || 508 ((arcn->pad > 0) && (wr_skip(arcn->pad) < 0))) 509 break; 510 } 511 512 /* 513 * tell format to write trailer; pad to block boundary; reset directory 514 * mode/access times, and check if all patterns supplied by the user 515 * were matched. block off signals to avoid chance for multiple entry 516 * into the cleanup code 517 */ 518 if (wr_one) { 519 (*frmt->end_wr)(); 520 wr_fin(); 521 } 522 (void)sigprocmask(SIG_BLOCK, &s_mask, (sigset_t *)NULL); 523 ar_close(); 524 if (tflag) 525 proc_dir(); 526 ftree_chk(); 527 } 528 529 /* 530 * append() 531 * Add file to previously written archive. Archive format specified by the 532 * user must agree with archive. The archive is read first to collect 533 * modification times (if -u) and locate the archive trailer. The archive 534 * is positioned in front of the record with the trailer and wr_archive() 535 * is called to add the new members. 536 * PAX IMPLEMENTATION DETAIL NOTE: 537 * -u is implemented by adding the new members to the end of the archive. 538 * Care is taken so that these do not end up as links to the older 539 * version of the same file already stored in the archive. It is expected 540 * when extraction occurs these newer versions will over-write the older 541 * ones stored "earlier" in the archive (this may be a bad assumption as 542 * it depends on the implementation of the program doing the extraction). 543 * It is really difficult to splice in members without either re-writing 544 * the entire archive (from the point were the old version was), or having 545 * assistance of the format specification in terms of a special update 546 * header that invalidates a previous archive record. The POSIX spec left 547 * the method used to implement -u unspecified. This pax is able to 548 * over write existing files that it creates. 549 */ 550 551 #if __STDC__ 552 void 553 append(void) 554 #else 555 void 556 append() 557 #endif 558 { 559 register ARCHD *arcn; 560 register int res; 561 ARCHD archd; 562 FSUB *orgfrmt; 563 int udev; 564 off_t tlen; 565 566 arcn = &archd; 567 orgfrmt = frmt; 568 569 /* 570 * Do not allow an append operation if the actual archive is of a 571 * different format than the user specified format. 572 */ 573 if (get_arc() < 0) 574 return; 575 if ((orgfrmt != NULL) && (orgfrmt != frmt)) { 576 pax_warn(1, "Cannot mix current archive format %s with %s", 577 frmt->name, orgfrmt->name); 578 return; 579 } 580 581 /* 582 * pass the format any options and start up format 583 */ 584 if (((*frmt->options)() < 0) || ((*frmt->st_rd)() < 0)) 585 return; 586 587 /* 588 * if we only are adding members that are newer, we need to save the 589 * mod times for all files we see. 590 */ 591 if (uflag && (ftime_start() < 0)) 592 return; 593 594 /* 595 * some archive formats encode hard links by recording the device and 596 * file serial number (inode) but copy the file anyway (multiple times) 597 * to the archive. When we append, we run the risk that newly added 598 * files may have the same device and inode numbers as those recorded 599 * on the archive but during a previous run. If this happens, when the 600 * archive is extracted we get INCORRECT hard links. We avoid this by 601 * remapping the device numbers so that newly added files will never 602 * use the same device number as one found on the archive. remapping 603 * allows new members to safely have links among themselves. remapping 604 * also avoids problems with file inode (serial number) truncations 605 * when the inode number is larger than storage space in the archive 606 * header. See the remap routines for more details. 607 */ 608 if ((udev = frmt->udev) && (dev_start() < 0)) 609 return; 610 611 /* 612 * reading the archive may take a long time. If verbose tell the user 613 */ 614 if (vflag) { 615 (void)fprintf(stderr, 616 "%s: Reading archive to position at the end...", argv0); 617 vfpart = 1; 618 } 619 620 /* 621 * step through the archive until the format says it is done 622 */ 623 while (next_head(arcn) == 0) { 624 /* 625 * check if this file meets user specified options. 626 */ 627 if (sel_chk(arcn) != 0) { 628 if (rd_skip(arcn->skip + arcn->pad) == 1) 629 break; 630 continue; 631 } 632 633 if (uflag) { 634 /* 635 * see if this is the newest version of this file has 636 * already been seen, if so skip. 637 */ 638 if ((res = chk_ftime(arcn)) < 0) 639 break; 640 if (res > 0) { 641 if (rd_skip(arcn->skip + arcn->pad) == 1) 642 break; 643 continue; 644 } 645 } 646 647 /* 648 * Store this device number. Device numbers seen during the 649 * read phase of append will cause newly appended files with a 650 * device number seen in the old part of the archive to be 651 * remapped to an unused device number. 652 */ 653 if ((udev && (add_dev(arcn) < 0)) || 654 (rd_skip(arcn->skip + arcn->pad) == 1)) 655 break; 656 } 657 658 /* 659 * done, finish up read and get the number of bytes to back up so we 660 * can add new members. The format might have used the hard link table, 661 * purge it. 662 */ 663 tlen = (*frmt->end_rd)(); 664 lnk_end(); 665 666 /* 667 * try to position for write, if this fails quit. if any error occurs, 668 * we will refuse to write 669 */ 670 if (appnd_start(tlen) < 0) 671 return; 672 673 /* 674 * tell the user we are done reading. 675 */ 676 if (vflag && vfpart) { 677 (void)fputs("done.\n", stderr); 678 vfpart = 0; 679 } 680 681 /* 682 * go to the writing phase to add the new members 683 */ 684 wr_archive(arcn, 1); 685 } 686 687 /* 688 * archive() 689 * write a new archive 690 */ 691 692 #if __STDC__ 693 void 694 archive(void) 695 #else 696 void 697 archive() 698 #endif 699 { 700 ARCHD archd; 701 702 /* 703 * if we only are adding members that are newer, we need to save the 704 * mod times for all files; set up for writing; pass the format any 705 * options write the archive 706 */ 707 if ((uflag && (ftime_start() < 0)) || (wr_start() < 0)) 708 return; 709 if ((*frmt->options)() < 0) 710 return; 711 712 wr_archive(&archd, 0); 713 } 714 715 /* 716 * copy() 717 * copy files from one part of the file system to another. this does not 718 * use any archive storage. The EFFECT OF THE COPY IS THE SAME as if an 719 * archive was written and then extracted in the destination directory 720 * (except the files are forced to be under the destination directory). 721 */ 722 723 #if __STDC__ 724 void 725 copy(void) 726 #else 727 void 728 copy() 729 #endif 730 { 731 register ARCHD *arcn; 732 register int res; 733 register int fddest; 734 register char *dest_pt; 735 register int dlen; 736 register int drem; 737 int fdsrc = -1; 738 struct stat sb; 739 ARCHD archd; 740 char dirbuf[PAXPATHLEN+1]; 741 742 arcn = &archd; 743 /* 744 * set up the destination dir path and make sure it is a directory. We 745 * make sure we have a trailing / on the destination 746 */ 747 dlen = l_strncpy(dirbuf, dirptr, sizeof(dirbuf) - 1); 748 dest_pt = dirbuf + dlen; 749 if (*(dest_pt-1) != '/') { 750 *dest_pt++ = '/'; 751 ++dlen; 752 } 753 *dest_pt = '\0'; 754 drem = PAXPATHLEN - dlen; 755 756 if (stat(dirptr, &sb) < 0) { 757 sys_warn(1, errno, "Cannot access destination directory %s", 758 dirptr); 759 return; 760 } 761 if (!S_ISDIR(sb.st_mode)) { 762 pax_warn(1, "Destination is not a directory %s", dirptr); 763 return; 764 } 765 766 /* 767 * start up the hard link table; file traversal routines and the 768 * modification time and access mode database 769 */ 770 if ((lnk_start() < 0) || (ftree_start() < 0) || (dir_start() < 0)) 771 return; 772 773 /* 774 * When we are doing interactive rename, we store the mapping of names 775 * so we can fix up hard links files later in the archive. 776 */ 777 if (iflag && (name_start() < 0)) 778 return; 779 780 /* 781 * set up to cp file trees 782 */ 783 cp_start(); 784 785 /* 786 * while there are files to archive, process them 787 */ 788 while (next_file(arcn) == 0) { 789 fdsrc = -1; 790 791 /* 792 * check if this file meets user specified options 793 */ 794 if (sel_chk(arcn) != 0) 795 continue; 796 797 /* 798 * if there is already a file in the destination directory with 799 * the same name and it is newer, skip the one stored on the 800 * archive. 801 * NOTE: this test is done BEFORE name modifications as 802 * specified by pax. this can be confusing to the user who 803 * might expect the test to be done on an existing file AFTER 804 * the name mod. In honesty the pax spec is probably flawed in 805 * this respect 806 */ 807 if (uflag || Dflag) { 808 /* 809 * create the destination name 810 */ 811 if (*(arcn->name) == '/') 812 res = 1; 813 else 814 res = 0; 815 if ((arcn->nlen - res) > drem) { 816 pax_warn(1, "Destination pathname too long %s", 817 arcn->name); 818 continue; 819 } 820 (void)strncpy(dest_pt, arcn->name + res, drem); 821 dirbuf[PAXPATHLEN] = '\0'; 822 823 /* 824 * if existing file is same age or newer skip 825 */ 826 res = lstat(dirbuf, &sb); 827 *dest_pt = '\0'; 828 829 if (res == 0) { 830 if (uflag && Dflag) { 831 if ((arcn->sb.st_mtime<=sb.st_mtime) && 832 (arcn->sb.st_ctime<=sb.st_ctime)) 833 continue; 834 } else if (Dflag) { 835 if (arcn->sb.st_ctime <= sb.st_ctime) 836 continue; 837 } else if (arcn->sb.st_mtime <= sb.st_mtime) 838 continue; 839 } 840 } 841 842 /* 843 * this file is considered selected. See if this is a hard link 844 * to a previous file; modify the name as requested by the 845 * user; set the final destination. 846 */ 847 ftree_sel(arcn); 848 if ((chk_lnk(arcn) < 0) || ((res = mod_name(arcn)) < 0)) 849 break; 850 if ((res > 0) || (set_dest(arcn, dirbuf, dlen) < 0)) { 851 /* 852 * skip file, purge from link table 853 */ 854 purg_lnk(arcn); 855 continue; 856 } 857 858 /* 859 * Non standard -Y and -Z flag. When the exisiting file is 860 * same age or newer skip 861 */ 862 if ((Yflag || Zflag) && ((lstat(arcn->name, &sb) == 0))) { 863 if (Yflag && Zflag) { 864 if ((arcn->sb.st_mtime <= sb.st_mtime) && 865 (arcn->sb.st_ctime <= sb.st_ctime)) 866 continue; 867 } else if (Yflag) { 868 if (arcn->sb.st_ctime <= sb.st_ctime) 869 continue; 870 } else if (arcn->sb.st_mtime <= sb.st_mtime) 871 continue; 872 } 873 874 if (vflag) { 875 (void)fputs(arcn->name, stderr); 876 vfpart = 1; 877 } 878 ++flcnt; 879 880 /* 881 * try to create a hard link to the src file if requested 882 * but make sure we are not trying to overwrite ourselves. 883 */ 884 if (lflag) 885 res = cross_lnk(arcn); 886 else 887 res = chk_same(arcn); 888 if (res <= 0) { 889 if (vflag && vfpart) { 890 (void)putc('\n', stderr); 891 vfpart = 0; 892 } 893 continue; 894 } 895 896 /* 897 * have to create a new file 898 */ 899 if ((arcn->type != PAX_REG) && (arcn->type != PAX_CTG)) { 900 /* 901 * create a link or special file 902 */ 903 if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) 904 res = lnk_creat(arcn); 905 else 906 res = node_creat(arcn); 907 if (res < 0) 908 purg_lnk(arcn); 909 if (vflag && vfpart) { 910 (void)putc('\n', stderr); 911 vfpart = 0; 912 } 913 continue; 914 } 915 916 /* 917 * have to copy a regular file to the destination directory. 918 * first open source file and then create the destination file 919 */ 920 if ((fdsrc = open(arcn->org_name, O_RDONLY, 0)) < 0) { 921 sys_warn(1, errno, "Unable to open %s to read", 922 arcn->org_name); 923 purg_lnk(arcn); 924 continue; 925 } 926 if ((fddest = file_creat(arcn)) < 0) { 927 rdfile_close(arcn, &fdsrc); 928 purg_lnk(arcn); 929 continue; 930 } 931 932 /* 933 * copy source file data to the destination file 934 */ 935 cp_file(arcn, fdsrc, fddest); 936 file_close(arcn, fddest); 937 rdfile_close(arcn, &fdsrc); 938 939 if (vflag && vfpart) { 940 (void)putc('\n', stderr); 941 vfpart = 0; 942 } 943 } 944 945 /* 946 * restore directory modes and times as required; make sure all 947 * patterns were selected block off signals to avoid chance for 948 * multiple entry into the cleanup code. 949 */ 950 (void)sigprocmask(SIG_BLOCK, &s_mask, (sigset_t *)NULL); 951 ar_close(); 952 proc_dir(); 953 ftree_chk(); 954 } 955 956 /* 957 * next_head() 958 * try to find a valid header in the archive. Uses format specific 959 * routines to extract the header and id the trailer. Trailers may be 960 * located within a valid header or in an invalid header (the location 961 * is format specific. The inhead field from the option table tells us 962 * where to look for the trailer). 963 * We keep reading (and resyncing) until we get enough contiguous data 964 * to check for a header. If we cannot find one, we shift by a byte 965 * add a new byte from the archive to the end of the buffer and try again. 966 * If we get a read error, we throw out what we have (as we must have 967 * contiguous data) and start over again. 968 * ASSUMED: headers fit within a BLKMULT header. 969 * Return: 970 * 0 if we got a header, -1 if we are unable to ever find another one 971 * (we reached the end of input, or we reached the limit on retries. see 972 * the specs for rd_wrbuf() for more details) 973 */ 974 975 #if __STDC__ 976 static int 977 next_head(register ARCHD *arcn) 978 #else 979 static int 980 next_head(arcn) 981 register ARCHD *arcn; 982 #endif 983 { 984 register int ret; 985 register char *hdend; 986 register int res; 987 register int shftsz; 988 register int hsz; 989 register int in_resync = 0; /* set when we are in resync mode */ 990 int cnt = 0; /* counter for trailer function */ 991 992 /* 993 * set up initial conditions, we want a whole frmt->hsz block as we 994 * have no data yet. 995 */ 996 res = hsz = frmt->hsz; 997 hdend = hdbuf; 998 shftsz = hsz - 1; 999 for(;;) { 1000 /* 1001 * keep looping until we get a contiguous FULL buffer 1002 * (frmt->hsz is the proper size) 1003 */ 1004 for (;;) { 1005 if ((ret = rd_wrbuf(hdend, res)) == res) 1006 break; 1007 1008 /* 1009 * some kind of archive read problem, try to resync the 1010 * storage device, better give the user the bad news. 1011 */ 1012 if ((ret == 0) || (rd_sync() < 0)) { 1013 pax_warn(1,"Premature end of file on archive read"); 1014 return(-1); 1015 } 1016 if (!in_resync) { 1017 if (act == APPND) { 1018 pax_warn(1, 1019 "Archive I/O error, cannot continue"); 1020 return(-1); 1021 } 1022 pax_warn(1,"Archive I/O error. Trying to recover."); 1023 ++in_resync; 1024 } 1025 1026 /* 1027 * oh well, throw it all out and start over 1028 */ 1029 res = hsz; 1030 hdend = hdbuf; 1031 } 1032 1033 /* 1034 * ok we have a contiguous buffer of the right size. Call the 1035 * format read routine. If this was not a valid header and this 1036 * format stores trailers outside of the header, call the 1037 * format specific trailer routine to check for a trailer. We 1038 * have to watch out that we do not mis-identify file data or 1039 * block padding as a header or trailer. Format specific 1040 * trailer functions must NOT check for the trailer while we 1041 * are running in resync mode. Some trailer functions may tell 1042 * us that this block cannot contain a valid header either, so 1043 * we then throw out the entire block and start over. 1044 */ 1045 if ((*frmt->rd)(arcn, hdbuf) == 0) 1046 break; 1047 1048 if (!frmt->inhead) { 1049 /* 1050 * this format has trailers outside of valid headers 1051 */ 1052 if ((ret = (*frmt->trail)(hdbuf,in_resync,&cnt)) == 0){ 1053 /* 1054 * valid trailer found, drain input as required 1055 */ 1056 ar_drain(); 1057 return(-1); 1058 } 1059 1060 if (ret == 1) { 1061 /* 1062 * we are in resync and we were told to throw 1063 * the whole block out because none of the 1064 * bytes in this block can be used to form a 1065 * valid header 1066 */ 1067 res = hsz; 1068 hdend = hdbuf; 1069 continue; 1070 } 1071 } 1072 1073 /* 1074 * Brute force section. 1075 * not a valid header. We may be able to find a header yet. So 1076 * we shift over by one byte, and set up to read one byte at a 1077 * time from the archive and place it at the end of the buffer. 1078 * We will keep moving byte at a time until we find a header or 1079 * get a read error and have to start over. 1080 */ 1081 if (!in_resync) { 1082 if (act == APPND) { 1083 pax_warn(1,"Unable to append, archive header flaw"); 1084 return(-1); 1085 } 1086 pax_warn(1,"Invalid header, starting valid header search."); 1087 ++in_resync; 1088 } 1089 bcopy(hdbuf+1, hdbuf, shftsz); 1090 res = 1; 1091 hdend = hdbuf + shftsz; 1092 } 1093 1094 /* 1095 * ok got a valid header, check for trailer if format encodes it in the 1096 * the header. NOTE: the parameters are different than trailer routines 1097 * which encode trailers outside of the header! 1098 */ 1099 if (frmt->inhead && ((*frmt->trail)(arcn) == 0)) { 1100 /* 1101 * valid trailer found, drain input as required 1102 */ 1103 ar_drain(); 1104 return(-1); 1105 } 1106 1107 ++flcnt; 1108 return(0); 1109 } 1110 1111 /* 1112 * get_arc() 1113 * Figure out what format an archive is. Handles archive with flaws by 1114 * brute force searches for a legal header in any supported format. The 1115 * format id routines have to be careful to NOT mis-identify a format. 1116 * ASSUMED: headers fit within a BLKMULT header. 1117 * Return: 1118 * 0 if archive found -1 otherwise 1119 */ 1120 1121 #if __STDC__ 1122 static int 1123 get_arc(void) 1124 #else 1125 static int 1126 get_arc() 1127 #endif 1128 { 1129 register int i; 1130 register int hdsz = 0; 1131 register int res; 1132 register int minhd = BLKMULT; 1133 char *hdend; 1134 int notice = 0; 1135 1136 /* 1137 * find the smallest header size in all archive formats and then set up 1138 * to read the archive. 1139 */ 1140 for (i = 0; ford[i] >= 0; ++i) { 1141 if (fsub[ford[i]].hsz < minhd) 1142 minhd = fsub[ford[i]].hsz; 1143 } 1144 if (rd_start() < 0) 1145 return(-1); 1146 res = BLKMULT; 1147 hdsz = 0; 1148 hdend = hdbuf; 1149 for(;;) { 1150 for (;;) { 1151 /* 1152 * fill the buffer with at least the smallest header 1153 */ 1154 i = rd_wrbuf(hdend, res); 1155 if (i > 0) 1156 hdsz += i; 1157 if (hdsz >= minhd) 1158 break; 1159 1160 /* 1161 * if we cannot recover from a read error quit 1162 */ 1163 if ((i == 0) || (rd_sync() < 0)) 1164 goto out; 1165 1166 /* 1167 * when we get an error none of the data we already 1168 * have can be used to create a legal header (we just 1169 * got an error in the middle), so we throw it all out 1170 * and refill the buffer with fresh data. 1171 */ 1172 res = BLKMULT; 1173 hdsz = 0; 1174 hdend = hdbuf; 1175 if (!notice) { 1176 if (act == APPND) 1177 return(-1); 1178 pax_warn(1,"Cannot identify format. Searching..."); 1179 ++notice; 1180 } 1181 } 1182 1183 /* 1184 * we have at least the size of the smallest header in any 1185 * archive format. Look to see if we have a match. The array 1186 * ford[] is used to specify the header id order to reduce the 1187 * chance of incorrectly id'ing a valid header (some formats 1188 * may be subsets of each other and the order would then be 1189 * important). 1190 */ 1191 for (i = 0; ford[i] >= 0; ++i) { 1192 if ((*fsub[ford[i]].id)(hdbuf, hdsz) < 0) 1193 continue; 1194 frmt = &(fsub[ford[i]]); 1195 /* 1196 * yuck, to avoid slow special case code in the extract 1197 * routines, just push this header back as if it was 1198 * not seen. We have left extra space at start of the 1199 * buffer for this purpose. This is a bit ugly, but 1200 * adding all the special case code is far worse. 1201 */ 1202 pback(hdbuf, hdsz); 1203 return(0); 1204 } 1205 1206 /* 1207 * We have a flawed archive, no match. we start searching, but 1208 * we never allow additions to flawed archives 1209 */ 1210 if (!notice) { 1211 if (act == APPND) 1212 return(-1); 1213 pax_warn(1, "Cannot identify format. Searching..."); 1214 ++notice; 1215 } 1216 1217 /* 1218 * brute force search for a header that we can id. 1219 * we shift through byte at a time. this is slow, but we cannot 1220 * determine the nature of the flaw in the archive in a 1221 * portable manner 1222 */ 1223 if (--hdsz > 0) { 1224 bcopy(hdbuf+1, hdbuf, hdsz); 1225 res = BLKMULT - hdsz; 1226 hdend = hdbuf + hdsz; 1227 } else { 1228 res = BLKMULT; 1229 hdend = hdbuf; 1230 hdsz = 0; 1231 } 1232 } 1233 1234 out: 1235 /* 1236 * we cannot find a header, bow, apologize and quit 1237 */ 1238 pax_warn(1, "Sorry, unable to determine archive format."); 1239 return(-1); 1240 } 1241