1 /* $OpenBSD: tar.c,v 1.41 2006/03/04 20:24:55 otto Exp $ */
2 /* $NetBSD: tar.c,v 1.5 1995/03/21 09:07:49 cgd Exp $ */
5 * Copyright (c) 1992 Keith Muller.
6 * Copyright (c) 1992, 1993
7 * The Regents of the University of California. All rights reserved.
9 * This code is derived from software contributed to Berkeley by
10 * Keith Muller of the University of California, San Diego.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
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. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 static const char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94";
41 static const char rcsid[] = "$OpenBSD: tar.c,v 1.41 2006/03/04 20:24:55 otto Exp $";
45 #include <sys/types.h>
46 #include <sys/sysmacros.h>
49 #include <sys/param.h>
59 * Routines for reading, writing and header identify of various versions of tar
62 static size_t expandname(char *, size_t, char **, const char *, size_t);
63 static u_long tar_chksm(char *, int);
64 static char *name_split(char *, int);
65 static int ul_oct(u_long, char *, int, int);
67 static int uqd_oct(u_quad_t, char *, int, int);
70 static uid_t uid_nobody;
71 static uid_t uid_warn;
72 static gid_t gid_nobody;
73 static gid_t gid_warn;
76 * Routines common to all versions of tar
79 static int tar_nodir; /* do not write dirs under old tar */
80 char *gnu_name_string; /* GNU ././@LongLink hackery name */
81 char *gnu_link_string; /* GNU ././@LongLink hackery link */
85 * add the tar trailer of two null blocks
87 * 0 if ok, -1 otherwise (what wr_skip returns)
93 return(wr_skip((off_t)(NULLCNT*BLKMULT)));
98 * no cleanup needed here, just return size of trailer (for append)
100 * size of trailer (2 * BLKMULT)
106 return((off_t)(NULLCNT*BLKMULT));
111 * Called to determine if a header block is a valid trailer. We are passed
112 * the block, the in_sync flag (which tells us we are in resync mode;
113 * looking for a valid header), and cnt (which starts at zero) which is
114 * used to count the number of empty blocks we have seen so far.
116 * 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
117 * could never contain a header.
121 tar_trail(ARCHD *ignore, char *buf, int in_resync, int *cnt)
126 * look for all zero, trailer is two consecutive blocks of zero
128 for (i = 0; i < BLKMULT; ++i) {
134 * if not all zero it is not a trailer, but MIGHT be a header.
140 * When given a zero block, we must be careful!
141 * If we are not in resync mode, check for the trailer. Have to watch
142 * out that we do not mis-identify file data as the trailer, so we do
143 * NOT try to id a trailer during resync mode. During resync mode we
144 * might as well throw this block out since a valid header can NEVER be
145 * a block of all 0 (we must have a valid file name).
147 if (!in_resync && (++*cnt >= NULLCNT))
154 * convert an unsigned long to an octal string. many oddball field
155 * termination characters are used by the various versions of tar in the
156 * different fields. term selects which kind to use. str is '0' padded
157 * at the front to len. we are unable to use only one format as many old
158 * tar readers are very cranky about this.
160 * 0 if the number fit into the string, -1 otherwise
164 ul_oct(u_long val, char *str, int len, int term)
169 * term selects the appropriate character(s) for the end of the string
191 * convert and blank pad if there is space
194 *pt-- = '0' + (char)(val & 0x7);
195 if ((val = val >> 3) == (u_long)0)
201 if (val != (u_long)0)
209 * convert an u_quad_t to an octal string. one of many oddball field
210 * termination characters are used by the various versions of tar in the
211 * different fields. term selects which kind to use. str is '0' padded
212 * at the front to len. we are unable to use only one format as many old
213 * tar readers are very cranky about this.
215 * 0 if the number fit into the string, -1 otherwise
219 uqd_oct(u_quad_t val, char *str, int len, int term)
224 * term selects the appropriate character(s) for the end of the string
246 * convert and blank pad if there is space
249 *pt-- = '0' + (char)(val & 0x7);
250 if ((val = val >> 3) == 0)
256 if (val != (u_quad_t)0)
264 * calculate the checksum for a tar block counting the checksum field as
265 * all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
266 * NOTE: we use len to short circuit summing 0's on write since we ALWAYS
267 * pad headers with 0.
269 * unsigned long checksum
273 tar_chksm(char *blk, int len)
277 u_long chksm = BLNKSUM; /* initial value is checksum field sum */
280 * add the part of the block before the checksum field
283 stop = blk + CHK_OFFSET;
285 chksm += (u_long)(*pt++ & 0xff);
287 * move past the checksum field and keep going, spec counts the
288 * checksum field as the sum of 8 blanks (which is pre-computed as
290 * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
291 * starts, no point in summing zero's)
296 chksm += (u_long)(*pt++ & 0xff);
301 * Routines for old BSD style tar (also made portable to sysV tar)
306 * determine if a block given to us is a valid tar header (and not a USTAR
307 * header). We have to be on the lookout for those pesky blocks of all
310 * 0 if a tar header, -1 otherwise
314 tar_id(char *blk, int size)
322 uhd = (HD_USTAR *)blk;
325 * check for block of zero's first, a simple and fast test, then make
326 * sure this is not a ustar header by looking for the ustar magic
327 * cookie. We should use TMAGLEN, but some USTAR archive programs are
328 * wrong and create archives missing the \0. Last we check the
329 * checksum. If this is ok we have to assume it is a valid header.
331 if (hd->name[0] == '\0')
333 if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0)
335 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
337 force_one_volume = 1;
343 * handle tar format specific -o options
345 * 0 if ok -1 otherwise
353 while ((opt = opt_next()) != NULL) {
354 if (strcmp(opt->name, TAR_OPTION) ||
355 strcmp(opt->value, TAR_NODIR)) {
356 paxwarn(1, "Unknown tar format -o option/value pair %s=%s",
357 opt->name, opt->value);
358 paxwarn(1,"%s=%s is the only supported tar format option",
359 TAR_OPTION, TAR_NODIR);
364 * we only support one option, and only when writing
366 if ((act != APPND) && (act != ARCHIVE)) {
367 paxwarn(1, "%s=%s is only supported when writing.",
368 opt->name, opt->value);
379 * extract the values out of block already determined to be a tar header.
380 * store the values in the ARCHD parameter.
386 tar_rd(ARCHD *arcn, char *buf)
392 * we only get proper sized buffers passed to us
394 if (tar_id(buf, BLKMULT) < 0)
396 memset(arcn, 0, sizeof(*arcn));
397 arcn->org_name = arcn->name;
398 arcn->sb.st_nlink = 1;
401 * copy out the name and values in the stat buffer
404 if (hd->linkflag != LONGLINKTYPE && hd->linkflag != LONGNAMETYPE) {
405 arcn->nlen = expandname(arcn->name, sizeof(arcn->name),
406 &gnu_name_string, hd->name, sizeof(hd->name));
407 arcn->ln_nlen = expandname(arcn->ln_name, sizeof(arcn->ln_name),
408 &gnu_link_string, hd->linkname, sizeof(hd->linkname));
410 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) &
412 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
413 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
415 arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
417 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
419 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
420 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
423 * have to look at the last character, it may be a '/' and that is used
424 * to encode this as a directory
426 pt = &(arcn->name[arcn->nlen - 1]);
429 switch (hd->linkflag) {
432 * symbolic link, need to get the link name and set the type in
433 * the st_mode so -v printing will look correct.
435 arcn->type = PAX_SLK;
436 arcn->sb.st_mode |= S_IFLNK;
440 * hard link, need to get the link name, set the type in the
441 * st_mode and st_nlink so -v printing will look better.
443 arcn->type = PAX_HLK;
444 arcn->sb.st_nlink = 2;
447 * no idea of what type this thing really points at, but
448 * we set something for printing only.
450 arcn->sb.st_mode |= S_IFREG;
455 * GNU long link/file; we tag these here and let the
456 * pax internals deal with it -- too ugly otherwise.
459 hd->linkflag == LONGLINKTYPE ? PAX_GLL : PAX_GLF;
460 arcn->pad = TAR_PAD(arcn->sb.st_size);
461 arcn->skip = arcn->sb.st_size;
465 * It is a directory, set the mode for -v printing
467 arcn->type = PAX_DIR;
468 arcn->sb.st_mode |= S_IFDIR;
469 arcn->sb.st_nlink = 2;
475 * If we have a trailing / this is a directory and NOT a file.
477 arcn->ln_name[0] = '\0';
481 * it is a directory, set the mode for -v printing
483 arcn->type = PAX_DIR;
484 arcn->sb.st_mode |= S_IFDIR;
485 arcn->sb.st_nlink = 2;
488 * have a file that will be followed by data. Set the
489 * skip value to the size field and calculate the size
492 arcn->type = PAX_REG;
493 arcn->sb.st_mode |= S_IFREG;
494 arcn->pad = TAR_PAD(arcn->sb.st_size);
495 arcn->skip = arcn->sb.st_size;
501 * strip off any trailing slash.
512 * write a tar header for the file specified in the ARCHD to the archive.
513 * Have to check for file types that cannot be stored and file names that
514 * are too long. Be careful of the term (last arg) to ul_oct, each field
515 * of tar has it own spec for the termination character(s).
516 * ASSUMED: space after header in header block is zero filled
518 * 0 if file has data to be written after the header, 1 if file has NO
519 * data to write after the header, -1 if archive write failed
527 char hdblk[sizeof(HD_TAR)];
530 * check for those file system types which tar cannot store
532 switch (arcn->type) {
535 * user asked that dirs not be written to the archive
541 paxwarn(1, "Tar cannot archive a character device %s",
545 paxwarn(1, "Tar cannot archive a block device %s", arcn->org_name);
548 paxwarn(1, "Tar cannot archive a socket %s", arcn->org_name);
551 paxwarn(1, "Tar cannot archive a fifo %s", arcn->org_name);
556 if (arcn->ln_nlen > sizeof(hd->linkname)) {
557 paxwarn(1, "Link name too long for tar %s",
569 * check file name len, remember extra char for dirs (the / at the end)
572 if (arcn->type == PAX_DIR)
574 if (len > sizeof(hd->name)) {
575 paxwarn(1, "File name too long for tar %s", arcn->name);
580 * Copy the data out of the ARCHD into the tar header based on the type
581 * of the file. Remember, many tar readers want all fields to be
582 * padded with zero so we zero the header first. We then set the
583 * linkflag field (type), the linkname, the size, and set the padding
584 * (if any) to be added after the file data (0 for all other types,
585 * as they only have a header).
587 memset(hdblk, 0, sizeof(hdblk));
588 hd = (HD_TAR *)hdblk;
589 fieldcpy(hd->name, sizeof(hd->name), arcn->name, sizeof(arcn->name));
592 if (arcn->type == PAX_DIR) {
594 * directories are the same as files, except have a filename
595 * that ends with a /, we add the slash here. No data follows
598 hd->linkflag = AREGTYPE;
599 hd->name[len-1] = '/';
600 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
602 } else if (arcn->type == PAX_SLK) {
604 * no data follows this file, so no pad
606 hd->linkflag = SYMTYPE;
607 fieldcpy(hd->linkname, sizeof(hd->linkname), arcn->ln_name,
608 sizeof(arcn->ln_name));
609 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
611 } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
613 * no data follows this file, so no pad
615 hd->linkflag = LNKTYPE;
616 fieldcpy(hd->linkname, sizeof(hd->linkname), arcn->ln_name,
617 sizeof(arcn->ln_name));
618 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
622 * data follows this file, so set the pad
624 hd->linkflag = AREGTYPE;
626 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
627 sizeof(hd->size), 1)) {
629 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
630 sizeof(hd->size), 1)) {
632 paxwarn(1,"File is too large for tar %s", arcn->org_name);
635 arcn->pad = TAR_PAD(arcn->sb.st_size);
639 * copy those fields that are independent of the type
641 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
642 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
643 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
644 ul_oct((u_long)(u_int)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1))
648 * calculate and add the checksum, then write the header. A return of
649 * 0 tells the caller to now write the file data, 1 says no data needs
652 if (ul_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum,
653 sizeof(hd->chksum), 3))
655 if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0)
657 if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0)
659 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
665 * header field is out of range
667 paxwarn(1, "Tar header field is too small for %s", arcn->org_name);
672 * Routines for POSIX ustar
677 * initialization for ustar read
679 * 0 if ok, -1 otherwise
685 if ((usrtb_start() < 0) || (grptb_start() < 0))
692 * initialization for ustar write
694 * 0 if ok, -1 otherwise
700 if ((uidtb_start() < 0) || (gidtb_start() < 0))
707 * determine if a block given to us is a valid ustar header. We have to
708 * be on the lookout for those pesky blocks of all zero's
710 * 0 if a ustar header, -1 otherwise
714 ustar_id(char *blk, int size)
720 hd = (HD_USTAR *)blk;
723 * check for block of zero's first, a simple and fast test then check
724 * ustar magic cookie. We should use TMAGLEN, but some USTAR archive
725 * programs are fouled up and create archives missing the \0. Last we
726 * check the checksum. If ok we have to assume it is a valid header.
728 if (hd->prefix[0] == '\0' && hd->name[0] == '\0')
730 if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0)
732 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
739 * extract the values out of block already determined to be a ustar header.
740 * store the values in the ARCHD parameter.
746 ustar_rd(ARCHD *arcn, char *buf)
755 * we only get proper sized buffers
757 if (ustar_id(buf, BLKMULT) < 0)
759 memset(arcn, 0, sizeof(*arcn));
760 arcn->org_name = arcn->name;
761 arcn->sb.st_nlink = 1;
762 hd = (HD_USTAR *)buf;
765 * see if the filename is split into two parts. if, so joint the parts.
766 * we copy the prefix first and add a / between the prefix and name.
768 * the length passed to l_strncpy must be the length of the field
769 * being copied *from*, since these fields are NOT null terminated
770 * when full. the destination buffer is plenty big enough to hold
771 * the longest supported ustar path length, so there's no need
772 * to check against that.
775 if (*(hd->prefix) != '\0') {
776 cnt = fieldcpy(dest, sizeof(arcn->name) - 1, hd->prefix,
785 if (hd->typeflag != LONGLINKTYPE && hd->typeflag != LONGNAMETYPE) {
786 arcn->nlen = cnt + expandname(dest, sizeof(arcn->name) - cnt,
787 &gnu_name_string, hd->name, sizeof(hd->name));
788 arcn->ln_nlen = expandname(arcn->ln_name, sizeof(arcn->ln_name),
789 &gnu_link_string, hd->linkname, sizeof(hd->linkname));
793 * follow the spec to the letter. we should only have mode bits, strip
794 * off all other crud we may be passed.
796 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode, sizeof(hd->mode), OCT) &
799 arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
801 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
803 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
804 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
807 * If we can find the ascii names for gname and uname in the password
808 * and group files we will use the uid's and gid they bind. Otherwise
809 * we use the uid and gid values stored in the header. (This is what
810 * the posix spec wants).
812 hd->gname[sizeof(hd->gname) - 1] = '\0';
813 if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0)
814 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
815 hd->uname[sizeof(hd->uname) - 1] = '\0';
816 if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0)
817 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
820 * set the defaults, these may be changed depending on the file type
824 arcn->sb.st_rdev = (dev_t)0;
827 * set the mode and PAX type according to the typeflag in the header
829 switch (hd->typeflag) {
831 arcn->type = PAX_FIF;
832 arcn->sb.st_mode |= S_IFIFO;
835 arcn->type = PAX_DIR;
836 arcn->sb.st_mode |= S_IFDIR;
837 arcn->sb.st_nlink = 2;
840 * Some programs that create ustar archives append a '/'
841 * to the pathname for directories. This clearly violates
842 * ustar specs, but we will silently strip it off anyway.
844 if (arcn->name[arcn->nlen - 1] == '/')
845 arcn->name[--arcn->nlen] = '\0';
850 * this type requires the rdev field to be set.
852 if (hd->typeflag == BLKTYPE) {
853 arcn->type = PAX_BLK;
854 arcn->sb.st_mode |= S_IFBLK;
856 arcn->type = PAX_CHR;
857 arcn->sb.st_mode |= S_IFCHR;
859 devmajor = (dev_t)asc_ul(hd->devmajor,sizeof(hd->devmajor),OCT);
860 devminor = (dev_t)asc_ul(hd->devminor,sizeof(hd->devminor),OCT);
861 arcn->sb.st_rdev = TODEV(devmajor, devminor);
865 if (hd->typeflag == SYMTYPE) {
866 arcn->type = PAX_SLK;
867 arcn->sb.st_mode |= S_IFLNK;
869 arcn->type = PAX_HLK;
871 * so printing looks better
873 arcn->sb.st_mode |= S_IFREG;
874 arcn->sb.st_nlink = 2;
880 * GNU long link/file; we tag these here and let the
881 * pax internals deal with it -- too ugly otherwise.
884 hd->typeflag == LONGLINKTYPE ? PAX_GLL : PAX_GLF;
885 arcn->pad = TAR_PAD(arcn->sb.st_size);
886 arcn->skip = arcn->sb.st_size;
893 * these types have file data that follows. Set the skip and
896 arcn->type = PAX_REG;
897 arcn->pad = TAR_PAD(arcn->sb.st_size);
898 arcn->skip = arcn->sb.st_size;
899 arcn->sb.st_mode |= S_IFREG;
907 * write a ustar header for the file specified in the ARCHD to the archive
908 * Have to check for file types that cannot be stored and file names that
909 * are too long. Be careful of the term (last arg) to ul_oct, we only use
910 * '\0' for the termination character (this is different than picky tar)
911 * ASSUMED: space after header in header block is zero filled
913 * 0 if file has data to be written after the header, 1 if file has NO
914 * data to write after the header, -1 if archive write failed
918 ustar_wr(ARCHD *arcn)
922 char hdblk[sizeof(HD_USTAR)];
925 * check for those file system types ustar cannot store
927 if (arcn->type == PAX_SCK) {
928 paxwarn(1, "Ustar cannot archive a socket %s", arcn->org_name);
933 * check the length of the linkname
935 if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
936 (arcn->type == PAX_HRG)) && (arcn->ln_nlen > sizeof(hd->linkname))){
937 paxwarn(1, "Link name too long for ustar %s", arcn->ln_name);
942 * split the path name into prefix and name fields (if needed). if
943 * pt != arcn->name, the name has to be split
945 if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) {
946 paxwarn(1, "File name too long for ustar %s", arcn->name);
951 * zero out the header so we don't have to worry about zero fill below
953 memset(hdblk, 0, sizeof(hdblk));
954 hd = (HD_USTAR *)hdblk;
958 * split the name, or zero out the prefix
960 if (pt != arcn->name) {
962 * name was split, pt points at the / where the split is to
963 * occur, we remove the / and copy the first part to the prefix
966 fieldcpy(hd->prefix, sizeof(hd->prefix), arcn->name,
972 * copy the name part. this may be the whole path or the part after
975 fieldcpy(hd->name, sizeof(hd->name), pt,
976 sizeof(arcn->name) - (pt - arcn->name));
979 * set the fields in the header that are type dependent
981 switch (arcn->type) {
983 hd->typeflag = DIRTYPE;
984 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
989 if (arcn->type == PAX_CHR)
990 hd->typeflag = CHRTYPE;
992 hd->typeflag = BLKTYPE;
993 if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor,
994 sizeof(hd->devmajor), 3) ||
995 ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor,
996 sizeof(hd->devminor), 3) ||
997 ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
1001 hd->typeflag = FIFOTYPE;
1002 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
1008 if (arcn->type == PAX_SLK)
1009 hd->typeflag = SYMTYPE;
1011 hd->typeflag = LNKTYPE;
1012 fieldcpy(hd->linkname, sizeof(hd->linkname), arcn->ln_name,
1013 sizeof(arcn->ln_name));
1014 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
1021 * file data with this type, set the padding
1023 if (arcn->type == PAX_CTG)
1024 hd->typeflag = CONTTYPE;
1026 hd->typeflag = REGTYPE;
1027 arcn->pad = TAR_PAD(arcn->sb.st_size);
1029 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
1030 sizeof(hd->size), 3)) {
1032 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
1033 sizeof(hd->size), 3)) {
1035 paxwarn(1,"File is too long for ustar %s",arcn->org_name);
1041 strncpy(hd->magic, TMAGIC, TMAGLEN);
1042 strncpy(hd->version, TVERSION, TVERSLEN);
1045 * set the remaining fields. Some versions want all 16 bits of mode
1046 * we better humor them (they really do not meet spec though)....
1048 if (ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3)) {
1049 if (uid_nobody == 0) {
1050 if (uid_name("nobody", &uid_nobody) == -1)
1053 if (uid_warn != arcn->sb.st_uid) {
1054 uid_warn = arcn->sb.st_uid;
1056 "Ustar header field is too small for uid %lu, "
1057 "using nobody", (u_long)arcn->sb.st_uid);
1059 if (ul_oct((u_long)uid_nobody, hd->uid, sizeof(hd->uid), 3))
1062 if (ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3)) {
1063 if (gid_nobody == 0) {
1064 if (gid_name("nobody", &gid_nobody) == -1)
1067 if (gid_warn != arcn->sb.st_gid) {
1068 gid_warn = arcn->sb.st_gid;
1070 "Ustar header field is too small for gid %lu, "
1071 "using nobody", (u_long)arcn->sb.st_gid);
1073 if (ul_oct((u_long)gid_nobody, hd->gid, sizeof(hd->gid), 3))
1076 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) ||
1077 ul_oct((u_long)(u_int)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
1079 strncpy(hd->uname, name_uid(arcn->sb.st_uid, 0), sizeof(hd->uname));
1080 strncpy(hd->gname, name_gid(arcn->sb.st_gid, 0), sizeof(hd->gname));
1083 * calculate and store the checksum write the header to the archive
1084 * return 0 tells the caller to now write the file data, 1 says no data
1085 * needs to be written
1087 if (ul_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum,
1088 sizeof(hd->chksum), 3))
1090 if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0)
1092 if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
1094 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
1100 * header field is out of range
1102 paxwarn(1, "Ustar header field is too small for %s", arcn->org_name);
1108 * see if the name has to be split for storage in a ustar header. We try
1109 * to fit the entire name in the name field without splitting if we can.
1110 * The split point is always at a /
1112 * character pointer to split point (always the / that is to be removed
1113 * if the split is not needed, the points is set to the start of the file
1114 * name (it would violate the spec to split there). A NULL is returned if
1115 * the file name is too long
1119 name_split(char *name, int len)
1124 * check to see if the file name is small enough to fit in the name
1125 * field. if so just return a pointer to the name.
1126 * The strings can fill the complete name and prefix fields
1127 * without a NUL terminator.
1131 if (len > (TPFSZ + TNMSZ + 1))
1135 * we start looking at the biggest sized piece that fits in the name
1136 * field. We walk forward looking for a slash to split at. The idea is
1137 * to find the biggest piece to fit in the name field (or the smallest
1138 * prefix we can find) (the -1 is correct the biggest piece would
1139 * include the slash between the two parts that gets thrown away)
1141 start = name + len - TNMSZ - 1;
1142 while ((*start != '\0') && (*start != '/'))
1146 * if we hit the end of the string, this name cannot be split, so we
1147 * cannot store this file.
1154 * NOTE: /str where the length of str == TNMSZ can not be stored under
1155 * the p1003.1-1990 spec for ustar. We could force a prefix of / and
1156 * the file would then expand on extract to //str. The len == 0 below
1157 * makes this special case follow the spec to the letter.
1159 if ((len > TPFSZ) || (len == 0))
1163 * ok have a split point, return it to the caller
1169 expandname(char *buf, size_t len, char **gnu_name, const char *name,
1175 /* *gnu_name is NUL terminated */
1176 if ((nlen = strlcpy(buf, *gnu_name, len)) >= len)
1181 nlen = fieldcpy(buf, len, name, limit);