1 /* $OpenBSD: tar.c,v 1.4 1996/08/27 03:53:14 tholo Exp $ */ 2 /* $NetBSD: tar.c,v 1.5 1995/03/21 09:07:49 cgd Exp $ */ 3 4 /*- 5 * Copyright (c) 1992 Keith Muller. 6 * Copyright (c) 1992, 1993 7 * The Regents of the University of California. All rights reserved. 8 * 9 * This code is derived from software contributed to Berkeley by 10 * Keith Muller of the University of California, San Diego. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94"; 44 #else 45 static char rcsid[] = "$OpenBSD: tar.c,v 1.4 1996/08/27 03:53:14 tholo Exp $"; 46 #endif 47 #endif /* not lint */ 48 49 #include <sys/types.h> 50 #include <sys/time.h> 51 #include <sys/stat.h> 52 #include <sys/param.h> 53 #include <string.h> 54 #include <stdio.h> 55 #include <unistd.h> 56 #include <stdlib.h> 57 #include "pax.h" 58 #include "extern.h" 59 #include "tar.h" 60 61 /* 62 * Routines for reading, writing and header identify of various versions of tar 63 */ 64 65 static u_long tar_chksm __P((register char *, register int)); 66 static char *name_split __P((register char *, register int)); 67 static int ul_oct __P((u_long, register char *, register int, int)); 68 #ifndef NET2_STAT 69 static int uqd_oct __P((u_quad_t, register char *, register int, int)); 70 #endif 71 72 /* 73 * Routines common to all versions of tar 74 */ 75 76 static int tar_nodir; /* do not write dirs under old tar */ 77 78 /* 79 * tar_endwr() 80 * add the tar trailer of two null blocks 81 * Return: 82 * 0 if ok, -1 otherwise (what wr_skip returns) 83 */ 84 85 #if __STDC__ 86 int 87 tar_endwr(void) 88 #else 89 int 90 tar_endwr() 91 #endif 92 { 93 return(wr_skip((off_t)(NULLCNT*BLKMULT))); 94 } 95 96 /* 97 * tar_endrd() 98 * no cleanup needed here, just return size of trailer (for append) 99 * Return: 100 * size of trailer (2 * BLKMULT) 101 */ 102 103 #if __STDC__ 104 off_t 105 tar_endrd(void) 106 #else 107 off_t 108 tar_endrd() 109 #endif 110 { 111 return((off_t)(NULLCNT*BLKMULT)); 112 } 113 114 /* 115 * tar_trail() 116 * Called to determine if a header block is a valid trailer. We are passed 117 * the block, the in_sync flag (which tells us we are in resync mode; 118 * looking for a valid header), and cnt (which starts at zero) which is 119 * used to count the number of empty blocks we have seen so far. 120 * Return: 121 * 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block 122 * could never contain a header. 123 */ 124 125 #if __STDC__ 126 int 127 tar_trail(register char *buf, register int in_resync, register int *cnt) 128 #else 129 int 130 tar_trail(buf, in_resync, cnt) 131 register char *buf; 132 register int in_resync; 133 register int *cnt; 134 #endif 135 { 136 register int i; 137 138 /* 139 * look for all zero, trailer is two consecutive blocks of zero 140 */ 141 for (i = 0; i < BLKMULT; ++i) { 142 if (buf[i] != '\0') 143 break; 144 } 145 146 /* 147 * if not all zero it is not a trailer, but MIGHT be a header. 148 */ 149 if (i != BLKMULT) 150 return(-1); 151 152 /* 153 * When given a zero block, we must be careful! 154 * If we are not in resync mode, check for the trailer. Have to watch 155 * out that we do not mis-identify file data as the trailer, so we do 156 * NOT try to id a trailer during resync mode. During resync mode we 157 * might as well throw this block out since a valid header can NEVER be 158 * a block of all 0 (we must have a valid file name). 159 */ 160 if (!in_resync && (++*cnt >= NULLCNT)) 161 return(0); 162 return(1); 163 } 164 165 /* 166 * ul_oct() 167 * convert an unsigned long to an octal string. many oddball field 168 * termination characters are used by the various versions of tar in the 169 * different fields. term selects which kind to use. str is BLANK padded 170 * at the front to len. we are unable to use only one format as many old 171 * tar readers are very cranky about this. 172 * Return: 173 * 0 if the number fit into the string, -1 otherwise 174 */ 175 176 #if __STDC__ 177 static int 178 ul_oct(u_long val, register char *str, register int len, int term) 179 #else 180 static int 181 ul_oct(val, str, len, term) 182 u_long val; 183 register char *str; 184 register int len; 185 int term; 186 #endif 187 { 188 register char *pt; 189 190 /* 191 * term selects the appropriate character(s) for the end of the string 192 */ 193 pt = str + len - 1; 194 switch(term) { 195 case 3: 196 *pt-- = '\0'; 197 break; 198 case 2: 199 *pt-- = ' '; 200 *pt-- = '\0'; 201 break; 202 case 1: 203 *pt-- = ' '; 204 break; 205 case 0: 206 default: 207 *pt-- = '\0'; 208 *pt-- = ' '; 209 break; 210 } 211 212 /* 213 * convert and blank pad if there is space 214 */ 215 while (pt >= str) { 216 *pt-- = '0' + (char)(val & 0x7); 217 if ((val = val >> 3) == (u_long)0) 218 break; 219 } 220 221 while (pt >= str) 222 *pt-- = ' '; 223 if (val != (u_long)0) 224 return(-1); 225 return(0); 226 } 227 228 #ifndef NET2_STAT 229 /* 230 * uqd_oct() 231 * convert an u_quad_t to an octal string. one of many oddball field 232 * termination characters are used by the various versions of tar in the 233 * different fields. term selects which kind to use. str is BLANK padded 234 * at the front to len. we are unable to use only one format as many old 235 * tar readers are very cranky about this. 236 * Return: 237 * 0 if the number fit into the string, -1 otherwise 238 */ 239 240 #if __STDC__ 241 static int 242 uqd_oct(u_quad_t val, register char *str, register int len, int term) 243 #else 244 static int 245 uqd_oct(val, str, len, term) 246 u_quad_t val; 247 register char *str; 248 register int len; 249 int term; 250 #endif 251 { 252 register char *pt; 253 254 /* 255 * term selects the appropriate character(s) for the end of the string 256 */ 257 pt = str + len - 1; 258 switch(term) { 259 case 3: 260 *pt-- = '\0'; 261 break; 262 case 2: 263 *pt-- = ' '; 264 *pt-- = '\0'; 265 break; 266 case 1: 267 *pt-- = ' '; 268 break; 269 case 0: 270 default: 271 *pt-- = '\0'; 272 *pt-- = ' '; 273 break; 274 } 275 276 /* 277 * convert and blank pad if there is space 278 */ 279 while (pt >= str) { 280 *pt-- = '0' + (char)(val & 0x7); 281 if ((val = val >> 3) == 0) 282 break; 283 } 284 285 while (pt >= str) 286 *pt-- = ' '; 287 if (val != (u_quad_t)0) 288 return(-1); 289 return(0); 290 } 291 #endif 292 293 /* 294 * tar_chksm() 295 * calculate the checksum for a tar block counting the checksum field as 296 * all blanks (BLNKSUM is that value pre-calculated, the sume of 8 blanks). 297 * NOTE: we use len to short circuit summing 0's on write since we ALWAYS 298 * pad headers with 0. 299 * Return: 300 * unsigned long checksum 301 */ 302 303 #if __STDC__ 304 static u_long 305 tar_chksm(register char *blk, register int len) 306 #else 307 static u_long 308 tar_chksm(blk, len) 309 register char *blk; 310 register int len; 311 #endif 312 { 313 register char *stop; 314 register char *pt; 315 u_long chksm = BLNKSUM; /* inital value is checksum field sum */ 316 317 /* 318 * add the part of the block before the checksum field 319 */ 320 pt = blk; 321 stop = blk + CHK_OFFSET; 322 while (pt < stop) 323 chksm += (u_long)(*pt++ & 0xff); 324 /* 325 * move past the checksum field and keep going, spec counts the 326 * checksum field as the sum of 8 blanks (which is pre-computed as 327 * BLNKSUM). 328 * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding 329 * starts, no point in summing zero's) 330 */ 331 pt += CHK_LEN; 332 stop = blk + len; 333 while (pt < stop) 334 chksm += (u_long)(*pt++ & 0xff); 335 return(chksm); 336 } 337 338 /* 339 * Routines for old BSD style tar (also made portable to sysV tar) 340 */ 341 342 /* 343 * tar_id() 344 * determine if a block given to us is a valid tar header (and not a USTAR 345 * header). We have to be on the lookout for those pesky blocks of all 346 * zero's. 347 * Return: 348 * 0 if a tar header, -1 otherwise 349 */ 350 351 #if __STDC__ 352 int 353 tar_id(register char *blk, int size) 354 #else 355 int 356 tar_id(blk, size) 357 register char *blk; 358 int size; 359 #endif 360 { 361 register HD_TAR *hd; 362 register HD_USTAR *uhd; 363 364 if (size < BLKMULT) 365 return(-1); 366 hd = (HD_TAR *)blk; 367 uhd = (HD_USTAR *)blk; 368 369 /* 370 * check for block of zero's first, a simple and fast test, then make 371 * sure this is not a ustar header by looking for the ustar magic 372 * cookie. We should use TMAGLEN, but some USTAR archive programs are 373 * wrong and create archives missing the \0. Last we check the 374 * checksum. If this is ok we have to assume it is a valid header. 375 */ 376 if (hd->name[0] == '\0') 377 return(-1); 378 if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0) 379 return(-1); 380 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT)) 381 return(-1); 382 return(0); 383 } 384 385 /* 386 * tar_opt() 387 * handle tar format specific -o options 388 * Return: 389 * 0 if ok -1 otherwise 390 */ 391 392 #if __STDC__ 393 int 394 tar_opt(void) 395 #else 396 int 397 tar_opt() 398 #endif 399 { 400 OPLIST *opt; 401 402 while ((opt = opt_next()) != NULL) { 403 if (strcmp(opt->name, TAR_OPTION) || 404 strcmp(opt->value, TAR_NODIR)) { 405 paxwarn(1, "Unknown tar format -o option/value pair %s=%s", 406 opt->name, opt->value); 407 paxwarn(1,"%s=%s is the only supported tar format option", 408 TAR_OPTION, TAR_NODIR); 409 return(-1); 410 } 411 412 /* 413 * we only support one option, and only when writing 414 */ 415 if ((act != APPND) && (act != ARCHIVE)) { 416 paxwarn(1, "%s=%s is only supported when writing.", 417 opt->name, opt->value); 418 return(-1); 419 } 420 tar_nodir = 1; 421 } 422 return(0); 423 } 424 425 426 /* 427 * tar_rd() 428 * extract the values out of block already determined to be a tar header. 429 * store the values in the ARCHD parameter. 430 * Return: 431 * 0 432 */ 433 434 #if __STDC__ 435 int 436 tar_rd(register ARCHD *arcn, register char *buf) 437 #else 438 int 439 tar_rd(arcn, buf) 440 register ARCHD *arcn; 441 register char *buf; 442 #endif 443 { 444 register HD_TAR *hd; 445 register char *pt; 446 447 /* 448 * we only get proper sized buffers passed to us 449 */ 450 if (tar_id(buf, BLKMULT) < 0) 451 return(-1); 452 arcn->org_name = arcn->name; 453 arcn->sb.st_nlink = 1; 454 arcn->pat = NULL; 455 456 /* 457 * copy out the name and values in the stat buffer 458 */ 459 hd = (HD_TAR *)buf; 460 arcn->nlen = l_strncpy(arcn->name, hd->name, sizeof(hd->name) - 1); 461 arcn->name[arcn->nlen] = '\0'; 462 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) & 463 0xfff); 464 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT); 465 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT); 466 arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT); 467 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT); 468 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime; 469 470 /* 471 * have to look at the last character, it may be a '/' and that is used 472 * to encode this as a directory 473 */ 474 pt = &(arcn->name[arcn->nlen - 1]); 475 arcn->pad = 0; 476 arcn->skip = 0; 477 switch(hd->linkflag) { 478 case SYMTYPE: 479 /* 480 * symbolic link, need to get the link name and set the type in 481 * the st_mode so -v printing will look correct. 482 */ 483 arcn->type = PAX_SLK; 484 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname, 485 sizeof(hd->linkname) - 1); 486 arcn->ln_name[arcn->ln_nlen] = '\0'; 487 arcn->sb.st_mode |= S_IFLNK; 488 break; 489 case LNKTYPE: 490 /* 491 * hard link, need to get the link name, set the type in the 492 * st_mode and st_nlink so -v printing will look better. 493 */ 494 arcn->type = PAX_HLK; 495 arcn->sb.st_nlink = 2; 496 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname, 497 sizeof(hd->linkname) - 1); 498 arcn->ln_name[arcn->ln_nlen] = '\0'; 499 500 /* 501 * no idea of what type this thing really points at, but 502 * we set something for printing only. 503 */ 504 arcn->sb.st_mode |= S_IFREG; 505 break; 506 case AREGTYPE: 507 case REGTYPE: 508 default: 509 /* 510 * If we have a trailing / this is a directory and NOT a file. 511 */ 512 arcn->ln_name[0] = '\0'; 513 arcn->ln_nlen = 0; 514 if (*pt == '/') { 515 /* 516 * it is a directory, set the mode for -v printing 517 */ 518 arcn->type = PAX_DIR; 519 arcn->sb.st_mode |= S_IFDIR; 520 arcn->sb.st_nlink = 2; 521 } else { 522 /* 523 * have a file that will be followed by data. Set the 524 * skip value to the size field and caluculate the size 525 * of the padding. 526 */ 527 arcn->type = PAX_REG; 528 arcn->sb.st_mode |= S_IFREG; 529 arcn->pad = TAR_PAD(arcn->sb.st_size); 530 arcn->skip = arcn->sb.st_size; 531 } 532 break; 533 } 534 535 /* 536 * strip off any trailing slash. 537 */ 538 if (*pt == '/') { 539 *pt = '\0'; 540 --arcn->nlen; 541 } 542 return(0); 543 } 544 545 /* 546 * tar_wr() 547 * write a tar header for the file specified in the ARCHD to the archive. 548 * Have to check for file types that cannot be stored and file names that 549 * are too long. Be careful of the term (last arg) to ul_oct, each field 550 * of tar has it own spec for the termination character(s). 551 * ASSUMED: space after header in header block is zero filled 552 * Return: 553 * 0 if file has data to be written after the header, 1 if file has NO 554 * data to write after the header, -1 if archive write failed 555 */ 556 557 #if __STDC__ 558 int 559 tar_wr(register ARCHD *arcn) 560 #else 561 int 562 tar_wr(arcn) 563 register ARCHD *arcn; 564 #endif 565 { 566 register HD_TAR *hd; 567 int len; 568 char hdblk[sizeof(HD_TAR)]; 569 570 /* 571 * check for those file system types which tar cannot store 572 */ 573 switch(arcn->type) { 574 case PAX_DIR: 575 /* 576 * user asked that dirs not be written to the archive 577 */ 578 if (tar_nodir) 579 return(1); 580 break; 581 case PAX_CHR: 582 paxwarn(1, "Tar cannot archive a character device %s", 583 arcn->org_name); 584 return(1); 585 case PAX_BLK: 586 paxwarn(1, "Tar cannot archive a block device %s", arcn->org_name); 587 return(1); 588 case PAX_SCK: 589 paxwarn(1, "Tar cannot archive a socket %s", arcn->org_name); 590 return(1); 591 case PAX_FIF: 592 paxwarn(1, "Tar cannot archive a fifo %s", arcn->org_name); 593 return(1); 594 case PAX_SLK: 595 case PAX_HLK: 596 case PAX_HRG: 597 if (arcn->ln_nlen > sizeof(hd->linkname)) { 598 paxwarn(1,"Link name too long for tar %s", arcn->ln_name); 599 return(1); 600 } 601 break; 602 case PAX_REG: 603 case PAX_CTG: 604 default: 605 break; 606 } 607 608 /* 609 * check file name len, remember extra char for dirs (the / at the end) 610 */ 611 len = arcn->nlen; 612 if (arcn->type == PAX_DIR) 613 ++len; 614 if (len > sizeof(hd->name)) { 615 paxwarn(1, "File name too long for tar %s", arcn->name); 616 return(1); 617 } 618 619 /* 620 * copy the data out of the ARCHD into the tar header based on the type 621 * of the file. Remember many tar readers want the unused fields to be 622 * padded with zero. We set the linkflag field (type), the linkname 623 * (or zero if not used),the size, and set the padding (if any) to be 624 * added after the file data (0 for all other types, as they only have 625 * a header) 626 */ 627 hd = (HD_TAR *)hdblk; 628 zf_strncpy(hd->name, arcn->name, sizeof(hd->name) - 1); 629 arcn->name[sizeof(hd->name) - 1] = '\0'; 630 arcn->pad = 0; 631 632 if (arcn->type == PAX_DIR) { 633 /* 634 * directories are the same as files, except have a filename 635 * that ends with a /, we add the slash here. No data follows, 636 * dirs, so no pad. 637 */ 638 hd->linkflag = AREGTYPE; 639 memset(hd->linkname, 0, sizeof(hd->linkname)); 640 hd->name[len-1] = '/'; 641 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1)) 642 goto out; 643 } else if (arcn->type == PAX_SLK) { 644 /* 645 * no data follows this file, so no pad 646 */ 647 hd->linkflag = SYMTYPE; 648 zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1); 649 hd->linkname[sizeof(hd->linkname) - 1] = '\0'; 650 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1)) 651 goto out; 652 } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) { 653 /* 654 * no data follows this file, so no pad 655 */ 656 hd->linkflag = LNKTYPE; 657 zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1); 658 hd->linkname[sizeof(hd->linkname) - 1] = '\0'; 659 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1)) 660 goto out; 661 } else { 662 /* 663 * data follows this file, so set the pad 664 */ 665 hd->linkflag = AREGTYPE; 666 memset(hd->linkname, 0, sizeof(hd->linkname)); 667 # ifdef NET2_STAT 668 if (ul_oct((u_long)arcn->sb.st_size, hd->size, 669 sizeof(hd->size), 1)) { 670 # else 671 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size, 672 sizeof(hd->size), 1)) { 673 # endif 674 paxwarn(1,"File is too large for tar %s", arcn->org_name); 675 return(1); 676 } 677 arcn->pad = TAR_PAD(arcn->sb.st_size); 678 } 679 680 /* 681 * copy those fields that are independent of the type 682 */ 683 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) || 684 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) || 685 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) || 686 ul_oct((u_long)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1)) 687 goto out; 688 689 /* 690 * calculate and add the checksum, then write the header. A return of 691 * 0 tells the caller to now write the file data, 1 says no data needs 692 * to be written 693 */ 694 if (ul_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum, 695 sizeof(hd->chksum), 2)) 696 goto out; 697 if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0) 698 return(-1); 699 if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0) 700 return(-1); 701 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG)) 702 return(0); 703 return(1); 704 705 out: 706 /* 707 * header field is out of range 708 */ 709 paxwarn(1, "Tar header field is too small for %s", arcn->org_name); 710 return(1); 711 } 712 713 /* 714 * Routines for POSIX ustar 715 */ 716 717 /* 718 * ustar_strd() 719 * initialization for ustar read 720 * Return: 721 * 0 if ok, -1 otherwise 722 */ 723 724 #if __STDC__ 725 int 726 ustar_strd(void) 727 #else 728 int 729 ustar_strd() 730 #endif 731 { 732 if ((usrtb_start() < 0) || (grptb_start() < 0)) 733 return(-1); 734 return(0); 735 } 736 737 /* 738 * ustar_stwr() 739 * initialization for ustar write 740 * Return: 741 * 0 if ok, -1 otherwise 742 */ 743 744 #if __STDC__ 745 int 746 ustar_stwr(void) 747 #else 748 int 749 ustar_stwr() 750 #endif 751 { 752 if ((uidtb_start() < 0) || (gidtb_start() < 0)) 753 return(-1); 754 return(0); 755 } 756 757 /* 758 * ustar_id() 759 * determine if a block given to us is a valid ustar header. We have to 760 * be on the lookout for those pesky blocks of all zero's 761 * Return: 762 * 0 if a ustar header, -1 otherwise 763 */ 764 765 #if __STDC__ 766 int 767 ustar_id(char *blk, int size) 768 #else 769 int 770 ustar_id(blk, size) 771 char *blk; 772 int size; 773 #endif 774 { 775 register HD_USTAR *hd; 776 777 if (size < BLKMULT) 778 return(-1); 779 hd = (HD_USTAR *)blk; 780 781 /* 782 * check for block of zero's first, a simple and fast test then check 783 * ustar magic cookie. We should use TMAGLEN, but some USTAR archive 784 * programs are fouled up and create archives missing the \0. Last we 785 * check the checksum. If ok we have to assume it is a valid header. 786 */ 787 if (hd->name[0] == '\0') 788 return(-1); 789 if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0) 790 return(-1); 791 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT)) 792 return(-1); 793 return(0); 794 } 795 796 /* 797 * ustar_rd() 798 * extract the values out of block already determined to be a ustar header. 799 * store the values in the ARCHD parameter. 800 * Return: 801 * 0 802 */ 803 804 #if __STDC__ 805 int 806 ustar_rd(register ARCHD *arcn, register char *buf) 807 #else 808 int 809 ustar_rd(arcn, buf) 810 register ARCHD *arcn; 811 register char *buf; 812 #endif 813 { 814 register HD_USTAR *hd; 815 register char *dest; 816 register int cnt = 0; 817 dev_t devmajor; 818 dev_t devminor; 819 820 /* 821 * we only get proper sized buffers 822 */ 823 if (ustar_id(buf, BLKMULT) < 0) 824 return(-1); 825 arcn->org_name = arcn->name; 826 arcn->sb.st_nlink = 1; 827 arcn->pat = NULL; 828 hd = (HD_USTAR *)buf; 829 830 /* 831 * see if the filename is split into two parts. if, so joint the parts. 832 * we copy the prefix first and add a / between the prefix and name. 833 */ 834 dest = arcn->name; 835 if (*(hd->prefix) != '\0') { 836 cnt = l_strncpy(arcn->name, hd->prefix, sizeof(hd->prefix) - 1); 837 hd->prefix[sizeof(hd->prefix) - 1] = '\0'; 838 dest = arcn->name + arcn->nlen; 839 *dest++ = '/'; 840 } 841 arcn->nlen = l_strncpy(dest, hd->name, sizeof(hd->name) - 1); 842 arcn->nlen += cnt; 843 arcn->name[arcn->nlen] = '\0'; 844 845 /* 846 * follow the spec to the letter. we should only have mode bits, strip 847 * off all other crud we may be passed. 848 */ 849 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode, sizeof(hd->mode), OCT) & 850 0xfff); 851 arcn->sb.st_size = (size_t)asc_ul(hd->size, sizeof(hd->size), OCT); 852 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT); 853 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime; 854 855 /* 856 * If we can find the ascii names for gname and uname in the password 857 * and group files we will use the uid's and gid they bind. Otherwise 858 * we use the uid and gid values stored in the header. (This is what 859 * the posix spec wants). 860 */ 861 hd->gname[sizeof(hd->gname) - 1] = '\0'; 862 if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0) 863 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT); 864 hd->uname[sizeof(hd->uname) - 1] = '\0'; 865 if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0) 866 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT); 867 868 /* 869 * set the defaults, these may be changed depending on the file type 870 */ 871 arcn->ln_name[0] = '\0'; 872 arcn->ln_nlen = 0; 873 arcn->pad = 0; 874 arcn->skip = 0; 875 arcn->sb.st_rdev = (dev_t)0; 876 877 /* 878 * set the mode and PAX type according to the typeflag in the header 879 */ 880 switch(hd->typeflag) { 881 case FIFOTYPE: 882 arcn->type = PAX_FIF; 883 arcn->sb.st_mode |= S_IFIFO; 884 break; 885 case DIRTYPE: 886 arcn->type = PAX_DIR; 887 arcn->sb.st_mode |= S_IFDIR; 888 arcn->sb.st_nlink = 2; 889 890 /* 891 * Some programs that create ustar archives append a '/' 892 * to the pathname for directories. This clearly violates 893 * ustar specs, but we will silently strip it off anyway. 894 */ 895 if (arcn->name[arcn->nlen - 1] == '/') 896 arcn->name[--arcn->nlen] = '\0'; 897 break; 898 case BLKTYPE: 899 case CHRTYPE: 900 /* 901 * this type requires the rdev field to be set. 902 */ 903 if (hd->typeflag == BLKTYPE) { 904 arcn->type = PAX_BLK; 905 arcn->sb.st_mode |= S_IFBLK; 906 } else { 907 arcn->type = PAX_CHR; 908 arcn->sb.st_mode |= S_IFCHR; 909 } 910 devmajor = (dev_t)asc_ul(hd->devmajor,sizeof(hd->devmajor),OCT); 911 devminor = (dev_t)asc_ul(hd->devminor,sizeof(hd->devminor),OCT); 912 arcn->sb.st_rdev = TODEV(devmajor, devminor); 913 break; 914 case SYMTYPE: 915 case LNKTYPE: 916 if (hd->typeflag == SYMTYPE) { 917 arcn->type = PAX_SLK; 918 arcn->sb.st_mode |= S_IFLNK; 919 } else { 920 arcn->type = PAX_HLK; 921 /* 922 * so printing looks better 923 */ 924 arcn->sb.st_mode |= S_IFREG; 925 arcn->sb.st_nlink = 2; 926 } 927 /* 928 * copy the link name 929 */ 930 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname, 931 sizeof(hd->linkname) - 1); 932 arcn->ln_name[arcn->ln_nlen] = '\0'; 933 break; 934 case CONTTYPE: 935 case AREGTYPE: 936 case REGTYPE: 937 default: 938 /* 939 * these types have file data that follows. Set the skip and 940 * pad fields. 941 */ 942 arcn->type = PAX_REG; 943 arcn->pad = TAR_PAD(arcn->sb.st_size); 944 arcn->skip = arcn->sb.st_size; 945 arcn->sb.st_mode |= S_IFREG; 946 break; 947 } 948 return(0); 949 } 950 951 /* 952 * ustar_wr() 953 * write a ustar header for the file specified in the ARCHD to the archive 954 * Have to check for file types that cannot be stored and file names that 955 * are too long. Be careful of the term (last arg) to ul_oct, we only use 956 * '\0' for the termination character (this is different than picky tar) 957 * ASSUMED: space after header in header block is zero filled 958 * Return: 959 * 0 if file has data to be written after the header, 1 if file has NO 960 * data to write after the header, -1 if archive write failed 961 */ 962 963 #if __STDC__ 964 int 965 ustar_wr(register ARCHD *arcn) 966 #else 967 int 968 ustar_wr(arcn) 969 register ARCHD *arcn; 970 #endif 971 { 972 register HD_USTAR *hd; 973 register char *pt; 974 char hdblk[sizeof(HD_USTAR)]; 975 976 /* 977 * check for those file system types ustar cannot store 978 */ 979 if (arcn->type == PAX_SCK) { 980 paxwarn(1, "Ustar cannot archive a socket %s", arcn->org_name); 981 return(1); 982 } 983 984 /* 985 * check the length of the linkname 986 */ 987 if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) || 988 (arcn->type == PAX_HRG)) && (arcn->ln_nlen > sizeof(hd->linkname))){ 989 paxwarn(1, "Link name too long for ustar %s", arcn->ln_name); 990 return(1); 991 } 992 993 /* 994 * split the path name into prefix and name fields (if needed). if 995 * pt != arcn->name, the name has to be split 996 */ 997 if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) { 998 paxwarn(1, "File name too long for ustar %s", arcn->name); 999 return(1); 1000 } 1001 hd = (HD_USTAR *)hdblk; 1002 arcn->pad = 0L; 1003 1004 /* 1005 * split the name, or zero out the prefix 1006 */ 1007 if (pt != arcn->name) { 1008 /* 1009 * name was split, pt points at the / where the split is to 1010 * occur, we remove the / and copy the first part to the prefix 1011 */ 1012 *pt = '\0'; 1013 zf_strncpy(hd->prefix, arcn->name, sizeof(hd->prefix) - 1); 1014 *pt++ = '/'; 1015 } else 1016 memset(hd->prefix, 0, sizeof(hd->prefix)); 1017 1018 /* 1019 * copy the name part. this may be the whole path or the part after 1020 * the prefix 1021 */ 1022 zf_strncpy(hd->name, pt, sizeof(hd->name) - 1); 1023 hd->name[sizeof(hd->name) - 1] = '\0'; 1024 1025 /* 1026 * set the fields in the header that are type dependent 1027 */ 1028 switch(arcn->type) { 1029 case PAX_DIR: 1030 hd->typeflag = DIRTYPE; 1031 memset(hd->linkname, 0, sizeof(hd->linkname)); 1032 memset(hd->devmajor, 0, sizeof(hd->devmajor)); 1033 memset(hd->devminor, 0, sizeof(hd->devminor)); 1034 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3)) 1035 goto out; 1036 break; 1037 case PAX_CHR: 1038 case PAX_BLK: 1039 if (arcn->type == PAX_CHR) 1040 hd->typeflag = CHRTYPE; 1041 else 1042 hd->typeflag = BLKTYPE; 1043 memset(hd->linkname, 0, sizeof(hd->linkname)); 1044 if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor, 1045 sizeof(hd->devmajor), 3) || 1046 ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor, 1047 sizeof(hd->devminor), 3) || 1048 ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3)) 1049 goto out; 1050 break; 1051 case PAX_FIF: 1052 hd->typeflag = FIFOTYPE; 1053 memset(hd->linkname, 0, sizeof(hd->linkname)); 1054 memset(hd->devmajor, 0, sizeof(hd->devmajor)); 1055 memset(hd->devminor, 0, sizeof(hd->devminor)); 1056 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3)) 1057 goto out; 1058 break; 1059 case PAX_SLK: 1060 case PAX_HLK: 1061 case PAX_HRG: 1062 if (arcn->type == PAX_SLK) 1063 hd->typeflag = SYMTYPE; 1064 else 1065 hd->typeflag = LNKTYPE; 1066 zf_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1); 1067 hd->linkname[sizeof(hd->linkname) - 1] = '\0'; 1068 memset(hd->devmajor, 0, sizeof(hd->devmajor)); 1069 memset(hd->devminor, 0, sizeof(hd->devminor)); 1070 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3)) 1071 goto out; 1072 break; 1073 case PAX_REG: 1074 case PAX_CTG: 1075 default: 1076 /* 1077 * file data with this type, set the padding 1078 */ 1079 if (arcn->type == PAX_CTG) 1080 hd->typeflag = CONTTYPE; 1081 else 1082 hd->typeflag = REGTYPE; 1083 memset(hd->linkname, 0, sizeof(hd->linkname)); 1084 memset(hd->devmajor, 0, sizeof(hd->devmajor)); 1085 memset(hd->devminor, 0, sizeof(hd->devminor)); 1086 arcn->pad = TAR_PAD(arcn->sb.st_size); 1087 # ifdef NET2_STAT 1088 if (ul_oct((u_long)arcn->sb.st_size, hd->size, 1089 sizeof(hd->size), 3)) { 1090 # else 1091 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size, 1092 sizeof(hd->size), 3)) { 1093 # endif 1094 paxwarn(1,"File is too long for ustar %s",arcn->org_name); 1095 return(1); 1096 } 1097 break; 1098 } 1099 1100 zf_strncpy(hd->magic, TMAGIC, TMAGLEN); 1101 zf_strncpy(hd->version, TVERSION, TVERSLEN); 1102 1103 /* 1104 * set the remaining fields. Some versions want all 16 bits of mode 1105 * we better humor them (they really do not meet spec though).... 1106 */ 1107 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) || 1108 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3) || 1109 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3) || 1110 ul_oct((u_long)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3)) 1111 goto out; 1112 zf_strncpy(hd->uname,name_uid(arcn->sb.st_uid, 0),sizeof(hd->uname)); 1113 zf_strncpy(hd->gname,name_gid(arcn->sb.st_gid, 0),sizeof(hd->gname)); 1114 1115 /* 1116 * calculate and store the checksum write the header to the archive 1117 * return 0 tells the caller to now write the file data, 1 says no data 1118 * needs to be written 1119 */ 1120 if (ul_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum, 1121 sizeof(hd->chksum), 3)) 1122 goto out; 1123 if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0) 1124 return(-1); 1125 if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0) 1126 return(-1); 1127 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG)) 1128 return(0); 1129 return(1); 1130 1131 out: 1132 /* 1133 * header field is out of range 1134 */ 1135 paxwarn(1, "Ustar header field is too small for %s", arcn->org_name); 1136 return(1); 1137 } 1138 1139 /* 1140 * name_split() 1141 * see if the name has to be split for storage in a ustar header. We try 1142 * to fit the entire name in the name field without splitting if we can. 1143 * The split point is always at a / 1144 * Return 1145 * character pointer to split point (always the / that is to be removed 1146 * if the split is not needed, the points is set to the start of the file 1147 * name (it would violate the spec to split there). A NULL is returned if 1148 * the file name is too long 1149 */ 1150 1151 #if __STDC__ 1152 static char * 1153 name_split(register char *name, register int len) 1154 #else 1155 static char * 1156 name_split(name, len) 1157 register char *name; 1158 register int len; 1159 #endif 1160 { 1161 register char *start; 1162 1163 /* 1164 * check to see if the file name is small enough to fit in the name 1165 * field. if so just return a pointer to the name. 1166 */ 1167 if (len <= TNMSZ) 1168 return(name); 1169 if (len > (TPFSZ + TNMSZ + 1)) 1170 return(NULL); 1171 1172 /* 1173 * we start looking at the biggest sized piece that fits in the name 1174 * field. We walk foward looking for a slash to split at. The idea is 1175 * to find the biggest piece to fit in the name field (or the smallest 1176 * prefix we can find) (the -1 is correct the biggest piece would 1177 * include the slash between the two parts that gets thrown away) 1178 */ 1179 start = name + len - TNMSZ - 1; 1180 while ((*start != '\0') && (*start != '/')) 1181 ++start; 1182 1183 /* 1184 * if we hit the end of the string, this name cannot be split, so we 1185 * cannot store this file. 1186 */ 1187 if (*start == '\0') 1188 return(NULL); 1189 len = start - name; 1190 1191 /* 1192 * NOTE: /str where the length of str == TNMSZ can not be stored under 1193 * the p1003.1-1990 spec for ustar. We could force a prefix of / and 1194 * the file would then expand on extract to //str. The len == 0 below 1195 * makes this special case follow the spec to the letter. 1196 */ 1197 if ((len > TPFSZ) || (len == 0)) 1198 return(NULL); 1199 1200 /* 1201 * ok have a split point, return it to the caller 1202 */ 1203 return(start); 1204 } 1205