2 * Copyright (c) 1992 Keith Muller.
3 * Copyright (c) 1992, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
7 * Keith Muller of the University of California, San Diego.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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.
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
37 * @(#)tar.c 8.2 (Berkeley) 4/18/94
38 * $FreeBSD: src/bin/pax/tar.c,v 1.13.2.1 2001/08/01 05:03:12 obrien Exp $
39 * $DragonFly: src/bin/pax/tar.c,v 1.7 2006/09/27 21:58:08 pavalos Exp $
42 #include <sys/types.h>
54 * Routines for reading, writing and header identify of various versions of tar
57 static u_long tar_chksm (char *, int);
58 static char *name_split (char *, int);
59 static int ul_oct (u_long, char *, int, int);
60 static int uqd_oct (u_quad_t, char *, int, int);
63 * Routines common to all versions of tar
66 static int tar_nodir; /* do not write dirs under old tar */
70 * add the tar trailer of two null blocks
72 * 0 if ok, -1 otherwise (what wr_skip returns)
78 return(wr_skip((off_t)(NULLCNT*BLKMULT)));
83 * no cleanup needed here, just return size of trailer (for append)
85 * size of trailer (2 * BLKMULT)
91 return((off_t)(NULLCNT*BLKMULT));
96 * Called to determine if a header block is a valid trailer. We are passed
97 * the block, the in_sync flag (which tells us we are in resync mode;
98 * looking for a valid header), and cnt (which starts at zero) which is
99 * used to count the number of empty blocks we have seen so far.
101 * 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
102 * could never contain a header.
106 tar_trail(char *buf, int in_resync, int *cnt)
111 * look for all zero, trailer is two consecutive blocks of zero
113 for (i = 0; i < BLKMULT; ++i) {
119 * if not all zero it is not a trailer, but MIGHT be a header.
125 * When given a zero block, we must be careful!
126 * If we are not in resync mode, check for the trailer. Have to watch
127 * out that we do not mis-identify file data as the trailer, so we do
128 * NOT try to id a trailer during resync mode. During resync mode we
129 * might as well throw this block out since a valid header can NEVER be
130 * a block of all 0 (we must have a valid file name).
132 if (!in_resync && (++*cnt >= NULLCNT))
139 * convert an unsigned long to an octal string. many oddball field
140 * termination characters are used by the various versions of tar in the
141 * different fields. term selects which kind to use. str is '0' padded
142 * at the front to len. we are unable to use only one format as many old
143 * tar readers are very cranky about this.
145 * 0 if the number fit into the string, -1 otherwise
149 ul_oct(u_long val, char *str, int len, int term)
154 * term selects the appropriate character(s) for the end of the string
176 * convert and blank pad if there is space
179 *pt-- = '0' + (char)(val & 0x7);
180 if ((val = val >> 3) == (u_long)0)
186 if (val != (u_long)0)
193 * convert an u_quad_t to an octal string. one of many oddball field
194 * termination characters are used by the various versions of tar in the
195 * different fields. term selects which kind to use. str is '0' padded
196 * at the front to len. we are unable to use only one format as many old
197 * tar readers are very cranky about this.
199 * 0 if the number fit into the string, -1 otherwise
203 uqd_oct(u_quad_t val, char *str, int len, int term)
208 * term selects the appropriate character(s) for the end of the string
230 * convert and blank pad if there is space
233 *pt-- = '0' + (char)(val & 0x7);
234 if ((val = val >> 3) == 0)
240 if (val != (u_quad_t)0)
247 * calculate the checksum for a tar block counting the checksum field as
248 * all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
249 * NOTE: we use len to short circuit summing 0's on write since we ALWAYS
250 * pad headers with 0.
252 * unsigned long checksum
256 tar_chksm(char *blk, int len)
260 u_long chksm = BLNKSUM; /* initial value is checksum field sum */
263 * add the part of the block before the checksum field
266 stop = blk + CHK_OFFSET;
268 chksm += (u_long)(*pt++ & 0xff);
270 * move past the checksum field and keep going, spec counts the
271 * checksum field as the sum of 8 blanks (which is pre-computed as
273 * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
274 * starts, no point in summing zero's)
279 chksm += (u_long)(*pt++ & 0xff);
284 * Routines for old BSD style tar (also made portable to sysV tar)
289 * determine if a block given to us is a valid tar header (and not a USTAR
290 * header). We have to be on the lookout for those pesky blocks of all
293 * 0 if a tar header, -1 otherwise
297 tar_id(char *blk, int size)
305 uhd = (HD_USTAR *)blk;
308 * check for block of zero's first, a simple and fast test, then make
309 * sure this is not a ustar header by looking for the ustar magic
310 * cookie. We should use TMAGLEN, but some USTAR archive programs are
311 * wrong and create archives missing the \0. Last we check the
312 * checksum. If this is ok we have to assume it is a valid header.
314 if (hd->name[0] == '\0')
316 if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0)
318 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
325 * handle tar format specific -o options
327 * 0 if ok -1 otherwise
335 while ((opt = opt_next()) != NULL) {
336 if (strcmp(opt->name, TAR_OPTION) ||
337 strcmp(opt->value, TAR_NODIR)) {
338 paxwarn(1, "Unknown tar format -o option/value pair %s=%s",
339 opt->name, opt->value);
340 paxwarn(1,"%s=%s is the only supported tar format option",
341 TAR_OPTION, TAR_NODIR);
346 * we only support one option, and only when writing
348 if ((act != APPND) && (act != ARCHIVE)) {
349 paxwarn(1, "%s=%s is only supported when writing.",
350 opt->name, opt->value);
361 * extract the values out of block already determined to be a tar header.
362 * store the values in the ARCHD parameter.
368 tar_rd(ARCHD *arcn, char *buf)
374 * we only get proper sized buffers passed to us
376 if (tar_id(buf, BLKMULT) < 0)
378 arcn->org_name = arcn->name;
379 arcn->sb.st_nlink = 1;
383 * copy out the name and values in the stat buffer
386 arcn->nlen = l_strncpy(arcn->name, hd->name, sizeof(arcn->name) - 1);
387 arcn->name[arcn->nlen] = '\0';
388 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) &
390 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
391 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
392 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
393 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
394 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
397 * have to look at the last character, it may be a '/' and that is used
398 * to encode this as a directory
400 pt = &(arcn->name[arcn->nlen - 1]);
403 switch(hd->linkflag) {
406 * symbolic link, need to get the link name and set the type in
407 * the st_mode so -v printing will look correct.
409 arcn->type = PAX_SLK;
410 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
411 sizeof(arcn->ln_name) - 1);
412 arcn->ln_name[arcn->ln_nlen] = '\0';
413 arcn->sb.st_mode |= S_IFLNK;
417 * hard link, need to get the link name, set the type in the
418 * st_mode and st_nlink so -v printing will look better.
420 arcn->type = PAX_HLK;
421 arcn->sb.st_nlink = 2;
422 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
423 sizeof(arcn->ln_name) - 1);
424 arcn->ln_name[arcn->ln_nlen] = '\0';
427 * no idea of what type this thing really points at, but
428 * we set something for printing only.
430 arcn->sb.st_mode |= S_IFREG;
434 * It is a directory, set the mode for -v printing
436 arcn->type = PAX_DIR;
437 arcn->sb.st_mode |= S_IFDIR;
438 arcn->sb.st_nlink = 2;
439 arcn->ln_name[0] = '\0';
446 * If we have a trailing / this is a directory and NOT a file.
448 arcn->ln_name[0] = '\0';
452 * it is a directory, set the mode for -v printing
454 arcn->type = PAX_DIR;
455 arcn->sb.st_mode |= S_IFDIR;
456 arcn->sb.st_nlink = 2;
459 * have a file that will be followed by data. Set the
460 * skip value to the size field and calculate the size
463 arcn->type = PAX_REG;
464 arcn->sb.st_mode |= S_IFREG;
465 arcn->pad = TAR_PAD(arcn->sb.st_size);
466 arcn->skip = arcn->sb.st_size;
472 * strip off any trailing slash.
483 * write a tar header for the file specified in the ARCHD to the archive.
484 * Have to check for file types that cannot be stored and file names that
485 * are too long. Be careful of the term (last arg) to ul_oct, each field
486 * of tar has it own spec for the termination character(s).
487 * ASSUMED: space after header in header block is zero filled
489 * 0 if file has data to be written after the header, 1 if file has NO
490 * data to write after the header, -1 if archive write failed
498 char hdblk[sizeof(HD_TAR)];
501 * check for those file system types which tar cannot store
506 * user asked that dirs not be written to the archive
512 paxwarn(1, "Tar cannot archive a character device %s",
516 paxwarn(1, "Tar cannot archive a block device %s", arcn->org_name);
519 paxwarn(1, "Tar cannot archive a socket %s", arcn->org_name);
522 paxwarn(1, "Tar cannot archive a fifo %s", arcn->org_name);
527 if (arcn->ln_nlen > sizeof(hd->linkname)) {
528 paxwarn(1,"Link name too long for tar %s", arcn->ln_name);
539 * check file name len, remember extra char for dirs (the / at the end)
542 if (arcn->type == PAX_DIR)
544 if (len >= sizeof(hd->name)) {
545 paxwarn(1, "File name too long for tar %s", arcn->name);
550 * copy the data out of the ARCHD into the tar header based on the type
551 * of the file. Remember many tar readers want the unused fields to be
552 * padded with zero. We set the linkflag field (type), the linkname
553 * (or zero if not used),the size, and set the padding (if any) to be
554 * added after the file data (0 for all other types, as they only have
557 hd = (HD_TAR *)hdblk;
558 l_strncpy(hd->name, arcn->name, sizeof(hd->name) - 1);
559 hd->name[sizeof(hd->name) - 1] = '\0';
562 if (arcn->type == PAX_DIR) {
564 * directories are the same as files, except have a filename
565 * that ends with a /, we add the slash here. No data follows
568 hd->linkflag = AREGTYPE;
569 memset(hd->linkname, 0, sizeof(hd->linkname));
570 hd->name[len-1] = '/';
571 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
573 } else if (arcn->type == PAX_SLK) {
575 * no data follows this file, so no pad
577 hd->linkflag = SYMTYPE;
578 l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
579 hd->linkname[sizeof(hd->linkname) - 1] = '\0';
580 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
582 } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
584 * no data follows this file, so no pad
586 hd->linkflag = LNKTYPE;
587 l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
588 hd->linkname[sizeof(hd->linkname) - 1] = '\0';
589 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
593 * data follows this file, so set the pad
595 hd->linkflag = AREGTYPE;
596 memset(hd->linkname, 0, sizeof(hd->linkname));
597 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
598 sizeof(hd->size), 1)) {
599 paxwarn(1,"File is too large for tar %s", arcn->org_name);
602 arcn->pad = TAR_PAD(arcn->sb.st_size);
606 * copy those fields that are independent of the type
608 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
609 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
610 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
611 ul_oct((u_long)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1))
615 * calculate and add the checksum, then write the header. A return of
616 * 0 tells the caller to now write the file data, 1 says no data needs
619 if (ul_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum,
620 sizeof(hd->chksum), 3))
622 if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0)
624 if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0)
626 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
632 * header field is out of range
634 paxwarn(1, "Tar header field is too small for %s", arcn->org_name);
639 * Routines for POSIX ustar
644 * initialization for ustar read
646 * 0 if ok, -1 otherwise
652 if ((usrtb_start() < 0) || (grptb_start() < 0))
659 * initialization for ustar write
661 * 0 if ok, -1 otherwise
667 if ((uidtb_start() < 0) || (gidtb_start() < 0))
674 * determine if a block given to us is a valid ustar header. We have to
675 * be on the lookout for those pesky blocks of all zero's
677 * 0 if a ustar header, -1 otherwise
681 ustar_id(char *blk, int size)
687 hd = (HD_USTAR *)blk;
690 * check for block of zero's first, a simple and fast test then check
691 * ustar magic cookie. We should use TMAGLEN, but some USTAR archive
692 * programs are fouled up and create archives missing the \0. Last we
693 * check the checksum. If ok we have to assume it is a valid header.
695 if (hd->name[0] == '\0')
697 if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0)
699 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
706 * extract the values out of block already determined to be a ustar header.
707 * store the values in the ARCHD parameter.
713 ustar_rd(ARCHD *arcn, char *buf)
722 * we only get proper sized buffers
724 if (ustar_id(buf, BLKMULT) < 0)
726 arcn->org_name = arcn->name;
727 arcn->sb.st_nlink = 1;
730 hd = (HD_USTAR *)buf;
733 * see if the filename is split into two parts. if, so joint the parts.
734 * we copy the prefix first and add a / between the prefix and name.
737 if (*(hd->prefix) != '\0') {
738 cnt = l_strncpy(dest, hd->prefix, sizeof(arcn->name) - 2);
743 arcn->nlen = cnt + l_strncpy(dest, hd->name, sizeof(arcn->name) - cnt);
744 arcn->name[arcn->nlen] = '\0';
747 * follow the spec to the letter. we should only have mode bits, strip
748 * off all other crud we may be passed.
750 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode, sizeof(hd->mode), OCT) &
752 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
753 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
754 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
757 * If we can find the ascii names for gname and uname in the password
758 * and group files we will use the uid's and gid they bind. Otherwise
759 * we use the uid and gid values stored in the header. (This is what
760 * the POSIX spec wants).
762 hd->gname[sizeof(hd->gname) - 1] = '\0';
763 if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0)
764 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
765 hd->uname[sizeof(hd->uname) - 1] = '\0';
766 if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0)
767 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
770 * set the defaults, these may be changed depending on the file type
772 arcn->ln_name[0] = '\0';
776 arcn->sb.st_rdev = (dev_t)0;
779 * set the mode and PAX type according to the typeflag in the header
781 switch(hd->typeflag) {
783 arcn->type = PAX_FIF;
784 arcn->sb.st_mode |= S_IFIFO;
787 arcn->type = PAX_DIR;
788 arcn->sb.st_mode |= S_IFDIR;
789 arcn->sb.st_nlink = 2;
792 * Some programs that create ustar archives append a '/'
793 * to the pathname for directories. This clearly violates
794 * ustar specs, but we will silently strip it off anyway.
796 if (arcn->name[arcn->nlen - 1] == '/')
797 arcn->name[--arcn->nlen] = '\0';
802 * this type requires the rdev field to be set.
804 if (hd->typeflag == BLKTYPE) {
805 arcn->type = PAX_BLK;
806 arcn->sb.st_mode |= S_IFBLK;
808 arcn->type = PAX_CHR;
809 arcn->sb.st_mode |= S_IFCHR;
811 devmajor = (dev_t)asc_ul(hd->devmajor,sizeof(hd->devmajor),OCT);
812 devminor = (dev_t)asc_ul(hd->devminor,sizeof(hd->devminor),OCT);
813 arcn->sb.st_rdev = TODEV(devmajor, devminor);
817 if (hd->typeflag == SYMTYPE) {
818 arcn->type = PAX_SLK;
819 arcn->sb.st_mode |= S_IFLNK;
821 arcn->type = PAX_HLK;
823 * so printing looks better
825 arcn->sb.st_mode |= S_IFREG;
826 arcn->sb.st_nlink = 2;
831 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
832 sizeof(arcn->ln_name) - 1);
833 arcn->ln_name[arcn->ln_nlen] = '\0';
840 * these types have file data that follows. Set the skip and
843 arcn->type = PAX_REG;
844 arcn->pad = TAR_PAD(arcn->sb.st_size);
845 arcn->skip = arcn->sb.st_size;
846 arcn->sb.st_mode |= S_IFREG;
854 * write a ustar header for the file specified in the ARCHD to the archive
855 * Have to check for file types that cannot be stored and file names that
856 * are too long. Be careful of the term (last arg) to ul_oct, we only use
857 * '\0' for the termination character (this is different than picky tar)
858 * ASSUMED: space after header in header block is zero filled
860 * 0 if file has data to be written after the header, 1 if file has NO
861 * data to write after the header, -1 if archive write failed
865 ustar_wr(ARCHD *arcn)
869 char hdblk[sizeof(HD_USTAR)];
872 * check for those file system types ustar cannot store
874 if (arcn->type == PAX_SCK) {
875 paxwarn(1, "Ustar cannot archive a socket %s", arcn->org_name);
880 * check the length of the linkname
882 if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
883 (arcn->type == PAX_HRG)) && (arcn->ln_nlen >= sizeof(hd->linkname))){
884 paxwarn(1, "Link name too long for ustar %s", arcn->ln_name);
889 * split the path name into prefix and name fields (if needed). if
890 * pt != arcn->name, the name has to be split
892 if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) {
893 paxwarn(1, "File name too long for ustar %s", arcn->name);
896 hd = (HD_USTAR *)hdblk;
900 * split the name, or zero out the prefix
902 if (pt != arcn->name) {
904 * name was split, pt points at the / where the split is to
905 * occur, we remove the / and copy the first part to the prefix
908 l_strncpy(hd->prefix, arcn->name, sizeof(hd->prefix) - 1);
911 memset(hd->prefix, 0, sizeof(hd->prefix));
914 * copy the name part. this may be the whole path or the part after
917 l_strncpy(hd->name, pt, sizeof(hd->name) - 1);
918 hd->name[sizeof(hd->name) - 1] = '\0';
921 * set the fields in the header that are type dependent
925 hd->typeflag = DIRTYPE;
926 memset(hd->linkname, 0, sizeof(hd->linkname));
927 memset(hd->devmajor, 0, sizeof(hd->devmajor));
928 memset(hd->devminor, 0, sizeof(hd->devminor));
929 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
934 if (arcn->type == PAX_CHR)
935 hd->typeflag = CHRTYPE;
937 hd->typeflag = BLKTYPE;
938 memset(hd->linkname, 0, sizeof(hd->linkname));
939 if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor,
940 sizeof(hd->devmajor), 3) ||
941 ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor,
942 sizeof(hd->devminor), 3) ||
943 ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
947 hd->typeflag = FIFOTYPE;
948 memset(hd->linkname, 0, sizeof(hd->linkname));
949 memset(hd->devmajor, 0, sizeof(hd->devmajor));
950 memset(hd->devminor, 0, sizeof(hd->devminor));
951 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
957 if (arcn->type == PAX_SLK)
958 hd->typeflag = SYMTYPE;
960 hd->typeflag = LNKTYPE;
961 l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
962 hd->linkname[sizeof(hd->linkname) - 1] = '\0';
963 memset(hd->devmajor, 0, sizeof(hd->devmajor));
964 memset(hd->devminor, 0, sizeof(hd->devminor));
965 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
972 * file data with this type, set the padding
974 if (arcn->type == PAX_CTG)
975 hd->typeflag = CONTTYPE;
977 hd->typeflag = REGTYPE;
978 memset(hd->linkname, 0, sizeof(hd->linkname));
979 memset(hd->devmajor, 0, sizeof(hd->devmajor));
980 memset(hd->devminor, 0, sizeof(hd->devminor));
981 arcn->pad = TAR_PAD(arcn->sb.st_size);
982 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
983 sizeof(hd->size), 3)) {
984 paxwarn(1,"File is too long for ustar %s",arcn->org_name);
990 l_strncpy(hd->magic, TMAGIC, TMAGLEN);
991 l_strncpy(hd->version, TVERSION, TVERSLEN);
994 * set the remaining fields. Some versions want all 16 bits of mode
995 * we better humor them (they really do not meet spec though)....
997 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) ||
998 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3) ||
999 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3) ||
1000 ul_oct((u_long)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
1002 l_strncpy(hd->uname,name_uid(arcn->sb.st_uid, 0),sizeof(hd->uname));
1003 l_strncpy(hd->gname,name_gid(arcn->sb.st_gid, 0),sizeof(hd->gname));
1006 * calculate and store the checksum write the header to the archive
1007 * return 0 tells the caller to now write the file data, 1 says no data
1008 * needs to be written
1010 if (ul_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum,
1011 sizeof(hd->chksum), 3))
1013 if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0)
1015 if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
1017 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
1023 * header field is out of range
1025 paxwarn(1, "Ustar header field is too small for %s", arcn->org_name);
1031 * see if the name has to be split for storage in a ustar header. We try
1032 * to fit the entire name in the name field without splitting if we can.
1033 * The split point is always at a /
1035 * character pointer to split point (always the / that is to be removed
1036 * if the split is not needed, the points is set to the start of the file
1037 * name (it would violate the spec to split there). A NULL is returned if
1038 * the file name is too long
1042 name_split(char *name, int len)
1047 * check to see if the file name is small enough to fit in the name
1048 * field. if so just return a pointer to the name.
1052 if (len > (TPFSZ + TNMSZ))
1056 * we start looking at the biggest sized piece that fits in the name
1057 * field. We walk forward looking for a slash to split at. The idea is
1058 * to find the biggest piece to fit in the name field (or the smallest
1059 * prefix we can find)
1061 start = name + len - TNMSZ;
1062 while ((*start != '\0') && (*start != '/'))
1066 * if we hit the end of the string, this name cannot be split, so we
1067 * cannot store this file.
1074 * NOTE: /str where the length of str == TNMSZ can not be stored under
1075 * the p1003.1-1990 spec for ustar. We could force a prefix of / and
1076 * the file would then expand on extract to //str. The len == 0 below
1077 * makes this special case follow the spec to the letter.
1079 if ((len >= TPFSZ) || (len == 0))
1083 * ok have a split point, return it to the caller