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 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94";
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
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);
61 static int uqd_oct(u_quad_t, char *, int, int);
65 * Routines common to all versions of tar
68 static int tar_nodir; /* do not write dirs under old tar */
72 * add the tar trailer of two null blocks
74 * 0 if ok, -1 otherwise (what wr_skip returns)
80 return(wr_skip((off_t)(NULLCNT*BLKMULT)));
85 * no cleanup needed here, just return size of trailer (for append)
87 * size of trailer (2 * BLKMULT)
93 return((off_t)(NULLCNT*BLKMULT));
98 * Called to determine if a header block is a valid trailer. We are passed
99 * the block, the in_sync flag (which tells us we are in resync mode;
100 * looking for a valid header), and cnt (which starts at zero) which is
101 * used to count the number of empty blocks we have seen so far.
103 * 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
104 * could never contain a header.
108 tar_trail(char *buf, int in_resync, int *cnt)
113 * look for all zero, trailer is two consecutive blocks of zero
115 for (i = 0; i < BLKMULT; ++i) {
121 * if not all zero it is not a trailer, but MIGHT be a header.
127 * When given a zero block, we must be careful!
128 * If we are not in resync mode, check for the trailer. Have to watch
129 * out that we do not mis-identify file data as the trailer, so we do
130 * NOT try to id a trailer during resync mode. During resync mode we
131 * might as well throw this block out since a valid header can NEVER be
132 * a block of all 0 (we must have a valid file name).
134 if (!in_resync && (++*cnt >= NULLCNT))
141 * convert an unsigned long to an octal string. many oddball field
142 * termination characters are used by the various versions of tar in the
143 * different fields. term selects which kind to use. str is '0' padded
144 * at the front to len. we are unable to use only one format as many old
145 * tar readers are very cranky about this.
147 * 0 if the number fit into the string, -1 otherwise
151 ul_oct(u_long val, char *str, int len, int term)
156 * term selects the appropriate character(s) for the end of the string
178 * convert and blank pad if there is space
181 *pt-- = '0' + (char)(val & 0x7);
182 if ((val = val >> 3) == (u_long)0)
188 if (val != (u_long)0)
196 * convert an u_quad_t to an octal string. one of many oddball field
197 * termination characters are used by the various versions of tar in the
198 * different fields. term selects which kind to use. str is '0' padded
199 * at the front to len. we are unable to use only one format as many old
200 * tar readers are very cranky about this.
202 * 0 if the number fit into the string, -1 otherwise
206 uqd_oct(u_quad_t val, char *str, int len, int term)
211 * term selects the appropriate character(s) for the end of the string
233 * convert and blank pad if there is space
236 *pt-- = '0' + (char)(val & 0x7);
237 if ((val = val >> 3) == 0)
243 if (val != (u_quad_t)0)
251 * calculate the checksum for a tar block counting the checksum field as
252 * all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
253 * NOTE: we use len to short circuit summing 0's on write since we ALWAYS
254 * pad headers with 0.
256 * unsigned long checksum
260 tar_chksm(char *blk, int len)
264 u_long chksm = BLNKSUM; /* initial value is checksum field sum */
267 * add the part of the block before the checksum field
270 stop = blk + CHK_OFFSET;
272 chksm += (u_long)(*pt++ & 0xff);
274 * move past the checksum field and keep going, spec counts the
275 * checksum field as the sum of 8 blanks (which is pre-computed as
277 * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
278 * starts, no point in summing zero's)
283 chksm += (u_long)(*pt++ & 0xff);
288 * Routines for old BSD style tar (also made portable to sysV tar)
293 * determine if a block given to us is a valid tar header (and not a USTAR
294 * header). We have to be on the lookout for those pesky blocks of all
297 * 0 if a tar header, -1 otherwise
301 tar_id(char *blk, int size)
309 uhd = (HD_USTAR *)blk;
312 * check for block of zero's first, a simple and fast test, then make
313 * sure this is not a ustar header by looking for the ustar magic
314 * cookie. We should use TMAGLEN, but some USTAR archive programs are
315 * wrong and create archives missing the \0. Last we check the
316 * checksum. If this is ok we have to assume it is a valid header.
318 if (hd->name[0] == '\0')
320 if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0)
322 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
329 * handle tar format specific -o options
331 * 0 if ok -1 otherwise
339 while ((opt = opt_next()) != NULL) {
340 if (strcmp(opt->name, TAR_OPTION) ||
341 strcmp(opt->value, TAR_NODIR)) {
342 paxwarn(1, "Unknown tar format -o option/value pair %s=%s",
343 opt->name, opt->value);
344 paxwarn(1,"%s=%s is the only supported tar format option",
345 TAR_OPTION, TAR_NODIR);
350 * we only support one option, and only when writing
352 if ((act != APPND) && (act != ARCHIVE)) {
353 paxwarn(1, "%s=%s is only supported when writing.",
354 opt->name, opt->value);
365 * extract the values out of block already determined to be a tar header.
366 * store the values in the ARCHD parameter.
372 tar_rd(ARCHD *arcn, char *buf)
378 * we only get proper sized buffers passed to us
380 if (tar_id(buf, BLKMULT) < 0)
382 arcn->org_name = arcn->name;
383 arcn->sb.st_nlink = 1;
387 * copy out the name and values in the stat buffer
391 * old tar format specifies the name always be null-terminated,
392 * but let's be robust to broken archives.
393 * the same applies to handling links below.
395 arcn->nlen = l_strncpy(arcn->name, hd->name,
396 MIN(sizeof(hd->name), sizeof(arcn->name)) - 1);
397 arcn->name[arcn->nlen] = '\0';
398 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) &
400 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
401 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
403 arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
404 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
406 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
407 arcn->sb.st_mtime = (time_t)asc_uqd(hd->mtime, sizeof(hd->mtime), OCT);
409 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
412 * have to look at the last character, it may be a '/' and that is used
413 * to encode this as a directory
415 pt = &(arcn->name[arcn->nlen - 1]);
418 switch(hd->linkflag) {
421 * symbolic link, need to get the link name and set the type in
422 * the st_mode so -v printing will look correct.
424 arcn->type = PAX_SLK;
425 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
426 MIN(sizeof(hd->linkname), sizeof(arcn->ln_name)) - 1);
427 arcn->ln_name[arcn->ln_nlen] = '\0';
428 arcn->sb.st_mode |= S_IFLNK;
432 * hard link, need to get the link name, set the type in the
433 * st_mode and st_nlink so -v printing will look better.
435 arcn->type = PAX_HLK;
436 arcn->sb.st_nlink = 2;
437 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
438 MIN(sizeof(hd->linkname), sizeof(arcn->ln_name)) - 1);
439 arcn->ln_name[arcn->ln_nlen] = '\0';
442 * no idea of what type this thing really points at, but
443 * we set something for printing only.
445 arcn->sb.st_mode |= S_IFREG;
449 * It is a directory, set the mode for -v printing
451 arcn->type = PAX_DIR;
452 arcn->sb.st_mode |= S_IFDIR;
453 arcn->sb.st_nlink = 2;
454 arcn->ln_name[0] = '\0';
461 * If we have a trailing / this is a directory and NOT a file.
463 arcn->ln_name[0] = '\0';
467 * it is a directory, set the mode for -v printing
469 arcn->type = PAX_DIR;
470 arcn->sb.st_mode |= S_IFDIR;
471 arcn->sb.st_nlink = 2;
474 * have a file that will be followed by data. Set the
475 * skip value to the size field and calculate the size
478 arcn->type = PAX_REG;
479 arcn->sb.st_mode |= S_IFREG;
480 arcn->pad = TAR_PAD(arcn->sb.st_size);
481 arcn->skip = arcn->sb.st_size;
487 * strip off any trailing slash.
498 * write a tar header for the file specified in the ARCHD to the archive.
499 * Have to check for file types that cannot be stored and file names that
500 * are too long. Be careful of the term (last arg) to ul_oct, each field
501 * of tar has it own spec for the termination character(s).
502 * ASSUMED: space after header in header block is zero filled
504 * 0 if file has data to be written after the header, 1 if file has NO
505 * data to write after the header, -1 if archive write failed
516 * check for those file system types which tar cannot store
521 * user asked that dirs not be written to the archive
527 paxwarn(1, "Tar cannot archive a character device %s",
531 paxwarn(1, "Tar cannot archive a block device %s", arcn->org_name);
534 paxwarn(1, "Tar cannot archive a socket %s", arcn->org_name);
537 paxwarn(1, "Tar cannot archive a fifo %s", arcn->org_name);
542 if (arcn->ln_nlen >= (int)sizeof(hd->linkname)) {
543 paxwarn(1,"Link name too long for tar %s", arcn->ln_name);
554 * check file name len, remember extra char for dirs (the / at the end)
557 if (arcn->type == PAX_DIR)
559 if (len >= (int)sizeof(hd->name)) {
560 paxwarn(1, "File name too long for tar %s", arcn->name);
565 * copy the data out of the ARCHD into the tar header based on the type
566 * of the file. Remember many tar readers want the unused fields to be
567 * padded with zero. We set the linkflag field (type), the linkname
568 * (or zero if not used),the size, and set the padding (if any) to be
569 * added after the file data (0 for all other types, as they only have
573 l_strncpy(hd->name, arcn->name, sizeof(hd->name) - 1);
574 hd->name[sizeof(hd->name) - 1] = '\0';
577 if (arcn->type == PAX_DIR) {
579 * directories are the same as files, except have a filename
580 * that ends with a /, we add the slash here. No data follows,
583 hd->linkflag = AREGTYPE;
584 memset(hd->linkname, 0, sizeof(hd->linkname));
585 hd->name[len-1] = '/';
586 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
588 } else if (arcn->type == PAX_SLK) {
590 * no data follows this file, so no pad
592 hd->linkflag = SYMTYPE;
593 l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
594 hd->linkname[sizeof(hd->linkname) - 1] = '\0';
595 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
597 } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
599 * no data follows this file, so no pad
601 hd->linkflag = LNKTYPE;
602 l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
603 hd->linkname[sizeof(hd->linkname) - 1] = '\0';
604 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
608 * data follows this file, so set the pad
610 hd->linkflag = AREGTYPE;
611 memset(hd->linkname, 0, sizeof(hd->linkname));
613 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
614 sizeof(hd->size), 1)) {
616 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
617 sizeof(hd->size), 1)) {
619 paxwarn(1,"File is too large for tar %s", arcn->org_name);
622 arcn->pad = TAR_PAD(arcn->sb.st_size);
626 * copy those fields that are independent of the type
628 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
629 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
630 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
631 ul_oct((u_long)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1))
635 * calculate and add the checksum, then write the header. A return of
636 * 0 tells the caller to now write the file data, 1 says no data needs
639 if (ul_oct(tar_chksm((char *)&hdblk, sizeof(HD_TAR)), hd->chksum,
640 sizeof(hd->chksum), 3))
642 if (wr_rdbuf((char *)&hdblk, sizeof(HD_TAR)) < 0)
644 if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0)
646 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
652 * header field is out of range
654 paxwarn(1, "Tar header field is too small for %s", arcn->org_name);
659 * Routines for POSIX ustar
664 * initialization for ustar read
666 * 0 if ok, -1 otherwise
672 if ((usrtb_start() < 0) || (grptb_start() < 0))
679 * initialization for ustar write
681 * 0 if ok, -1 otherwise
687 if ((uidtb_start() < 0) || (gidtb_start() < 0))
694 * determine if a block given to us is a valid ustar header. We have to
695 * be on the lookout for those pesky blocks of all zero's
697 * 0 if a ustar header, -1 otherwise
701 ustar_id(char *blk, int size)
707 hd = (HD_USTAR *)blk;
710 * check for block of zero's first, a simple and fast test then check
711 * ustar magic cookie. We should use TMAGLEN, but some USTAR archive
712 * programs are fouled up and create archives missing the \0. Last we
713 * check the checksum. If ok we have to assume it is a valid header.
715 if (hd->name[0] == '\0')
717 if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0)
719 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
726 * extract the values out of block already determined to be a ustar header.
727 * store the values in the ARCHD parameter.
733 ustar_rd(ARCHD *arcn, char *buf)
742 * we only get proper sized buffers
744 if (ustar_id(buf, BLKMULT) < 0)
746 arcn->org_name = arcn->name;
747 arcn->sb.st_nlink = 1;
750 hd = (HD_USTAR *)buf;
753 * see if the filename is split into two parts. if, so joint the parts.
754 * we copy the prefix first and add a / between the prefix and name.
757 if (*(hd->prefix) != '\0') {
758 cnt = l_strncpy(dest, hd->prefix,
759 MIN(sizeof(hd->prefix), sizeof(arcn->name) - 2));
765 * ustar format specifies the name may be unterminated
766 * if it fills the entire field. this also applies to
767 * the prefix and the linkname.
769 arcn->nlen = cnt + l_strncpy(dest, hd->name,
770 MIN(sizeof(hd->name), sizeof(arcn->name) - cnt - 1));
771 arcn->name[arcn->nlen] = '\0';
774 * follow the spec to the letter. we should only have mode bits, strip
775 * off all other crud we may be passed.
777 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode, sizeof(hd->mode), OCT) &
780 arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
781 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
783 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
784 arcn->sb.st_mtime = (time_t)asc_uqd(hd->mtime, sizeof(hd->mtime), OCT);
786 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
789 * If we can find the ascii names for gname and uname in the password
790 * and group files we will use the uid's and gid they bind. Otherwise
791 * we use the uid and gid values stored in the header. (This is what
792 * the POSIX spec wants).
794 hd->gname[sizeof(hd->gname) - 1] = '\0';
795 if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0)
796 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
797 hd->uname[sizeof(hd->uname) - 1] = '\0';
798 if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0)
799 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
802 * set the defaults, these may be changed depending on the file type
804 arcn->ln_name[0] = '\0';
808 arcn->sb.st_rdev = (dev_t)0;
811 * set the mode and PAX type according to the typeflag in the header
813 switch(hd->typeflag) {
815 arcn->type = PAX_FIF;
816 arcn->sb.st_mode |= S_IFIFO;
819 arcn->type = PAX_DIR;
820 arcn->sb.st_mode |= S_IFDIR;
821 arcn->sb.st_nlink = 2;
824 * Some programs that create ustar archives append a '/'
825 * to the pathname for directories. This clearly violates
826 * ustar specs, but we will silently strip it off anyway.
828 if (arcn->name[arcn->nlen - 1] == '/')
829 arcn->name[--arcn->nlen] = '\0';
834 * this type requires the rdev field to be set.
836 if (hd->typeflag == BLKTYPE) {
837 arcn->type = PAX_BLK;
838 arcn->sb.st_mode |= S_IFBLK;
840 arcn->type = PAX_CHR;
841 arcn->sb.st_mode |= S_IFCHR;
843 devmajor = (dev_t)asc_ul(hd->devmajor,sizeof(hd->devmajor),OCT);
844 devminor = (dev_t)asc_ul(hd->devminor,sizeof(hd->devminor),OCT);
845 arcn->sb.st_rdev = TODEV(devmajor, devminor);
849 if (hd->typeflag == SYMTYPE) {
850 arcn->type = PAX_SLK;
851 arcn->sb.st_mode |= S_IFLNK;
853 arcn->type = PAX_HLK;
855 * so printing looks better
857 arcn->sb.st_mode |= S_IFREG;
858 arcn->sb.st_nlink = 2;
863 arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
864 MIN(sizeof(hd->linkname), sizeof(arcn->ln_name) - 1));
865 arcn->ln_name[arcn->ln_nlen] = '\0';
872 * these types have file data that follows. Set the skip and
875 arcn->type = PAX_REG;
876 arcn->pad = TAR_PAD(arcn->sb.st_size);
877 arcn->skip = arcn->sb.st_size;
878 arcn->sb.st_mode |= S_IFREG;
886 * write a ustar header for the file specified in the ARCHD to the archive
887 * Have to check for file types that cannot be stored and file names that
888 * are too long. Be careful of the term (last arg) to ul_oct, we only use
889 * '\0' for the termination character (this is different than picky tar)
890 * ASSUMED: space after header in header block is zero filled
892 * 0 if file has data to be written after the header, 1 if file has NO
893 * data to write after the header, -1 if archive write failed
897 ustar_wr(ARCHD *arcn)
904 * check for those file system types ustar cannot store
906 if (arcn->type == PAX_SCK) {
907 paxwarn(1, "Ustar cannot archive a socket %s", arcn->org_name);
912 * check the length of the linkname
914 if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
915 (arcn->type == PAX_HRG)) &&
916 (arcn->ln_nlen > (int)sizeof(hd->linkname))) {
917 paxwarn(1, "Link name too long for ustar %s", arcn->ln_name);
922 * split the path name into prefix and name fields (if needed). if
923 * pt != arcn->name, the name has to be split
925 if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) {
926 paxwarn(1, "File name too long for ustar %s", arcn->name);
933 * split the name, or zero out the prefix
935 if (pt != arcn->name) {
937 * name was split, pt points at the / where the split is to
938 * occur, we remove the / and copy the first part to the prefix
941 l_strncpy(hd->prefix, arcn->name, sizeof(hd->prefix));
944 memset(hd->prefix, 0, sizeof(hd->prefix));
947 * copy the name part. this may be the whole path or the part after
948 * the prefix. both the name and prefix may fill the entire field.
950 l_strncpy(hd->name, pt, sizeof(hd->name));
953 * set the fields in the header that are type dependent
957 hd->typeflag = DIRTYPE;
958 memset(hd->linkname, 0, sizeof(hd->linkname));
959 memset(hd->devmajor, 0, sizeof(hd->devmajor));
960 memset(hd->devminor, 0, sizeof(hd->devminor));
961 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
966 if (arcn->type == PAX_CHR)
967 hd->typeflag = CHRTYPE;
969 hd->typeflag = BLKTYPE;
970 memset(hd->linkname, 0, sizeof(hd->linkname));
971 if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor,
972 sizeof(hd->devmajor), 3) ||
973 ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor,
974 sizeof(hd->devminor), 3) ||
975 ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
979 hd->typeflag = FIFOTYPE;
980 memset(hd->linkname, 0, sizeof(hd->linkname));
981 memset(hd->devmajor, 0, sizeof(hd->devmajor));
982 memset(hd->devminor, 0, sizeof(hd->devminor));
983 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
989 if (arcn->type == PAX_SLK)
990 hd->typeflag = SYMTYPE;
992 hd->typeflag = LNKTYPE;
993 /* the link name may occupy the entire field in ustar */
994 l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
995 memset(hd->devmajor, 0, sizeof(hd->devmajor));
996 memset(hd->devminor, 0, sizeof(hd->devminor));
997 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
1004 * file data with this type, set the padding
1006 if (arcn->type == PAX_CTG)
1007 hd->typeflag = CONTTYPE;
1009 hd->typeflag = REGTYPE;
1010 memset(hd->linkname, 0, sizeof(hd->linkname));
1011 memset(hd->devmajor, 0, sizeof(hd->devmajor));
1012 memset(hd->devminor, 0, sizeof(hd->devminor));
1013 arcn->pad = TAR_PAD(arcn->sb.st_size);
1015 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
1016 sizeof(hd->size), 3)) {
1018 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
1019 sizeof(hd->size), 3)) {
1021 paxwarn(1,"File is too long for ustar %s",arcn->org_name);
1027 l_strncpy(hd->magic, TMAGIC, TMAGLEN);
1028 l_strncpy(hd->version, TVERSION, TVERSLEN);
1031 * set the remaining fields. Some versions want all 16 bits of mode
1032 * we better humor them (they really do not meet spec though)....
1034 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) ||
1035 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3) ||
1036 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3) ||
1037 ul_oct((u_long)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
1039 l_strncpy(hd->uname,name_uid(arcn->sb.st_uid, 0),sizeof(hd->uname));
1040 l_strncpy(hd->gname,name_gid(arcn->sb.st_gid, 0),sizeof(hd->gname));
1043 * calculate and store the checksum write the header to the archive
1044 * return 0 tells the caller to now write the file data, 1 says no data
1045 * needs to be written
1047 if (ul_oct(tar_chksm((char *)&hdblk, sizeof(HD_USTAR)), hd->chksum,
1048 sizeof(hd->chksum), 3))
1050 if (wr_rdbuf((char *)&hdblk, sizeof(HD_USTAR)) < 0)
1052 if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
1054 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
1060 * header field is out of range
1062 paxwarn(1, "Ustar header field is too small for %s", arcn->org_name);
1068 * see if the name has to be split for storage in a ustar header. We try
1069 * to fit the entire name in the name field without splitting if we can.
1070 * The split point is always at a /
1072 * character pointer to split point (always the / that is to be removed
1073 * if the split is not needed, the points is set to the start of the file
1074 * name (it would violate the spec to split there). A NULL is returned if
1075 * the file name is too long
1079 name_split(char *name, int len)
1084 * check to see if the file name is small enough to fit in the name
1085 * field. if so just return a pointer to the name.
1089 if (len > TPFSZ + TNMSZ)
1093 * we start looking at the biggest sized piece that fits in the name
1094 * field. We walk forward looking for a slash to split at. The idea is
1095 * to find the biggest piece to fit in the name field (or the smallest
1096 * prefix we can find)
1098 start = name + len - TNMSZ;
1099 while ((*start != '\0') && (*start != '/'))
1103 * if we hit the end of the string, this name cannot be split, so we
1104 * cannot store this file.
1111 * NOTE: /str where the length of str == TNMSZ can not be stored under
1112 * the p1003.1-1990 spec for ustar. We could force a prefix of / and
1113 * the file would then expand on extract to //str. The len == 0 below
1114 * makes this special case follow the spec to the letter.
1116 if ((len > TPFSZ) || (len == 0))
1120 * ok have a split point, return it to the caller