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>
48 #include <sys/param.h>
58 * Routines for reading, writing and header identify of various versions of tar
61 static size_t expandname(char *, size_t, char **, const char *, size_t);
62 static u_long tar_chksm(char *, int);
63 static char *name_split(char *, int);
64 static int ul_oct(u_long, char *, int, int);
66 static int uqd_oct(u_quad_t, char *, int, int);
69 static uid_t uid_nobody;
70 static uid_t uid_warn;
71 static gid_t gid_nobody;
72 static gid_t gid_warn;
75 * Routines common to all versions of tar
78 static int tar_nodir; /* do not write dirs under old tar */
79 char *gnu_name_string; /* GNU ././@LongLink hackery name */
80 char *gnu_link_string; /* GNU ././@LongLink hackery link */
84 * add the tar trailer of two null blocks
86 * 0 if ok, -1 otherwise (what wr_skip returns)
92 return(wr_skip((off_t)(NULLCNT*BLKMULT)));
97 * no cleanup needed here, just return size of trailer (for append)
99 * size of trailer (2 * BLKMULT)
105 return((off_t)(NULLCNT*BLKMULT));
110 * Called to determine if a header block is a valid trailer. We are passed
111 * the block, the in_sync flag (which tells us we are in resync mode;
112 * looking for a valid header), and cnt (which starts at zero) which is
113 * used to count the number of empty blocks we have seen so far.
115 * 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
116 * could never contain a header.
120 tar_trail(ARCHD *ignore, char *buf, int in_resync, int *cnt)
125 * look for all zero, trailer is two consecutive blocks of zero
127 for (i = 0; i < BLKMULT; ++i) {
133 * if not all zero it is not a trailer, but MIGHT be a header.
139 * When given a zero block, we must be careful!
140 * If we are not in resync mode, check for the trailer. Have to watch
141 * out that we do not mis-identify file data as the trailer, so we do
142 * NOT try to id a trailer during resync mode. During resync mode we
143 * might as well throw this block out since a valid header can NEVER be
144 * a block of all 0 (we must have a valid file name).
146 if (!in_resync && (++*cnt >= NULLCNT))
153 * convert an unsigned long to an octal string. many oddball field
154 * termination characters are used by the various versions of tar in the
155 * different fields. term selects which kind to use. str is '0' padded
156 * at the front to len. we are unable to use only one format as many old
157 * tar readers are very cranky about this.
159 * 0 if the number fit into the string, -1 otherwise
163 ul_oct(u_long val, char *str, int len, int term)
168 * term selects the appropriate character(s) for the end of the string
190 * convert and blank pad if there is space
193 *pt-- = '0' + (char)(val & 0x7);
194 if ((val = val >> 3) == (u_long)0)
200 if (val != (u_long)0)
208 * convert an u_quad_t to an octal string. one of many oddball field
209 * termination characters are used by the various versions of tar in the
210 * different fields. term selects which kind to use. str is '0' padded
211 * at the front to len. we are unable to use only one format as many old
212 * tar readers are very cranky about this.
214 * 0 if the number fit into the string, -1 otherwise
218 uqd_oct(u_quad_t val, char *str, int len, int term)
223 * term selects the appropriate character(s) for the end of the string
245 * convert and blank pad if there is space
248 *pt-- = '0' + (char)(val & 0x7);
249 if ((val = val >> 3) == 0)
255 if (val != (u_quad_t)0)
263 * calculate the checksum for a tar block counting the checksum field as
264 * all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
265 * NOTE: we use len to short circuit summing 0's on write since we ALWAYS
266 * pad headers with 0.
268 * unsigned long checksum
272 tar_chksm(char *blk, int len)
276 u_long chksm = BLNKSUM; /* initial value is checksum field sum */
279 * add the part of the block before the checksum field
282 stop = blk + CHK_OFFSET;
284 chksm += (u_long)(*pt++ & 0xff);
286 * move past the checksum field and keep going, spec counts the
287 * checksum field as the sum of 8 blanks (which is pre-computed as
289 * ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
290 * starts, no point in summing zero's)
295 chksm += (u_long)(*pt++ & 0xff);
300 * Routines for old BSD style tar (also made portable to sysV tar)
305 * determine if a block given to us is a valid tar header (and not a USTAR
306 * header). We have to be on the lookout for those pesky blocks of all
309 * 0 if a tar header, -1 otherwise
313 tar_id(char *blk, int size)
321 uhd = (HD_USTAR *)blk;
324 * check for block of zero's first, a simple and fast test, then make
325 * sure this is not a ustar header by looking for the ustar magic
326 * cookie. We should use TMAGLEN, but some USTAR archive programs are
327 * wrong and create archives missing the \0. Last we check the
328 * checksum. If this is ok we have to assume it is a valid header.
330 if (hd->name[0] == '\0')
332 if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0)
334 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
336 force_one_volume = 1;
342 * handle tar format specific -o options
344 * 0 if ok -1 otherwise
352 while ((opt = opt_next()) != NULL) {
353 if (strcmp(opt->name, TAR_OPTION) ||
354 strcmp(opt->value, TAR_NODIR)) {
355 paxwarn(1, "Unknown tar format -o option/value pair %s=%s",
356 opt->name, opt->value);
357 paxwarn(1,"%s=%s is the only supported tar format option",
358 TAR_OPTION, TAR_NODIR);
363 * we only support one option, and only when writing
365 if ((act != APPND) && (act != ARCHIVE)) {
366 paxwarn(1, "%s=%s is only supported when writing.",
367 opt->name, opt->value);
378 * extract the values out of block already determined to be a tar header.
379 * store the values in the ARCHD parameter.
385 tar_rd(ARCHD *arcn, char *buf)
391 * we only get proper sized buffers passed to us
393 if (tar_id(buf, BLKMULT) < 0)
395 memset(arcn, 0, sizeof(*arcn));
396 arcn->org_name = arcn->name;
397 arcn->sb.st_nlink = 1;
400 * copy out the name and values in the stat buffer
403 if (hd->linkflag != LONGLINKTYPE && hd->linkflag != LONGNAMETYPE) {
404 arcn->nlen = expandname(arcn->name, sizeof(arcn->name),
405 &gnu_name_string, hd->name, sizeof(hd->name));
406 arcn->ln_nlen = expandname(arcn->ln_name, sizeof(arcn->ln_name),
407 &gnu_link_string, hd->linkname, sizeof(hd->linkname));
409 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) &
411 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
412 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
414 arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
416 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
418 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
419 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
422 * have to look at the last character, it may be a '/' and that is used
423 * to encode this as a directory
425 pt = &(arcn->name[arcn->nlen - 1]);
428 switch (hd->linkflag) {
431 * symbolic link, need to get the link name and set the type in
432 * the st_mode so -v printing will look correct.
434 arcn->type = PAX_SLK;
435 arcn->sb.st_mode |= S_IFLNK;
439 * hard link, need to get the link name, set the type in the
440 * st_mode and st_nlink so -v printing will look better.
442 arcn->type = PAX_HLK;
443 arcn->sb.st_nlink = 2;
446 * no idea of what type this thing really points at, but
447 * we set something for printing only.
449 arcn->sb.st_mode |= S_IFREG;
454 * GNU long link/file; we tag these here and let the
455 * pax internals deal with it -- too ugly otherwise.
458 hd->linkflag == LONGLINKTYPE ? PAX_GLL : PAX_GLF;
459 arcn->pad = TAR_PAD(arcn->sb.st_size);
460 arcn->skip = arcn->sb.st_size;
464 * It is a directory, set the mode for -v printing
466 arcn->type = PAX_DIR;
467 arcn->sb.st_mode |= S_IFDIR;
468 arcn->sb.st_nlink = 2;
474 * If we have a trailing / this is a directory and NOT a file.
476 arcn->ln_name[0] = '\0';
480 * it is a directory, set the mode for -v printing
482 arcn->type = PAX_DIR;
483 arcn->sb.st_mode |= S_IFDIR;
484 arcn->sb.st_nlink = 2;
487 * have a file that will be followed by data. Set the
488 * skip value to the size field and calculate the size
491 arcn->type = PAX_REG;
492 arcn->sb.st_mode |= S_IFREG;
493 arcn->pad = TAR_PAD(arcn->sb.st_size);
494 arcn->skip = arcn->sb.st_size;
500 * strip off any trailing slash.
511 * write a tar header for the file specified in the ARCHD to the archive.
512 * Have to check for file types that cannot be stored and file names that
513 * are too long. Be careful of the term (last arg) to ul_oct, each field
514 * of tar has it own spec for the termination character(s).
515 * ASSUMED: space after header in header block is zero filled
517 * 0 if file has data to be written after the header, 1 if file has NO
518 * data to write after the header, -1 if archive write failed
526 char hdblk[sizeof(HD_TAR)];
529 * check for those file system types which tar cannot store
531 switch (arcn->type) {
534 * user asked that dirs not be written to the archive
540 paxwarn(1, "Tar cannot archive a character device %s",
544 paxwarn(1, "Tar cannot archive a block device %s", arcn->org_name);
547 paxwarn(1, "Tar cannot archive a socket %s", arcn->org_name);
550 paxwarn(1, "Tar cannot archive a fifo %s", arcn->org_name);
555 if (arcn->ln_nlen > sizeof(hd->linkname)) {
556 paxwarn(1, "Link name too long for tar %s",
568 * check file name len, remember extra char for dirs (the / at the end)
571 if (arcn->type == PAX_DIR)
573 if (len > sizeof(hd->name)) {
574 paxwarn(1, "File name too long for tar %s", arcn->name);
579 * Copy the data out of the ARCHD into the tar header based on the type
580 * of the file. Remember, many tar readers want all fields to be
581 * padded with zero so we zero the header first. We then set the
582 * linkflag field (type), the linkname, the size, and set the padding
583 * (if any) to be added after the file data (0 for all other types,
584 * as they only have a header).
586 memset(hdblk, 0, sizeof(hdblk));
587 hd = (HD_TAR *)hdblk;
588 fieldcpy(hd->name, sizeof(hd->name), arcn->name, sizeof(arcn->name));
591 if (arcn->type == PAX_DIR) {
593 * directories are the same as files, except have a filename
594 * that ends with a /, we add the slash here. No data follows
597 hd->linkflag = AREGTYPE;
598 hd->name[len-1] = '/';
599 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
601 } else if (arcn->type == PAX_SLK) {
603 * no data follows this file, so no pad
605 hd->linkflag = SYMTYPE;
606 fieldcpy(hd->linkname, sizeof(hd->linkname), arcn->ln_name,
607 sizeof(arcn->ln_name));
608 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
610 } else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
612 * no data follows this file, so no pad
614 hd->linkflag = LNKTYPE;
615 fieldcpy(hd->linkname, sizeof(hd->linkname), arcn->ln_name,
616 sizeof(arcn->ln_name));
617 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
621 * data follows this file, so set the pad
623 hd->linkflag = AREGTYPE;
625 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
626 sizeof(hd->size), 1)) {
628 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
629 sizeof(hd->size), 1)) {
631 paxwarn(1,"File is too large for tar %s", arcn->org_name);
634 arcn->pad = TAR_PAD(arcn->sb.st_size);
638 * copy those fields that are independent of the type
640 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
641 ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
642 ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
643 ul_oct((u_long)(u_int)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1))
647 * calculate and add the checksum, then write the header. A return of
648 * 0 tells the caller to now write the file data, 1 says no data needs
651 if (ul_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum,
652 sizeof(hd->chksum), 3))
654 if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0)
656 if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0)
658 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
664 * header field is out of range
666 paxwarn(1, "Tar header field is too small for %s", arcn->org_name);
671 * Routines for POSIX ustar
676 * initialization for ustar read
678 * 0 if ok, -1 otherwise
684 if ((usrtb_start() < 0) || (grptb_start() < 0))
691 * initialization for ustar write
693 * 0 if ok, -1 otherwise
699 if ((uidtb_start() < 0) || (gidtb_start() < 0))
706 * determine if a block given to us is a valid ustar header. We have to
707 * be on the lookout for those pesky blocks of all zero's
709 * 0 if a ustar header, -1 otherwise
713 ustar_id(char *blk, int size)
719 hd = (HD_USTAR *)blk;
722 * check for block of zero's first, a simple and fast test then check
723 * ustar magic cookie. We should use TMAGLEN, but some USTAR archive
724 * programs are fouled up and create archives missing the \0. Last we
725 * check the checksum. If ok we have to assume it is a valid header.
727 if (hd->prefix[0] == '\0' && hd->name[0] == '\0')
729 if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0)
731 if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
738 * extract the values out of block already determined to be a ustar header.
739 * store the values in the ARCHD parameter.
745 ustar_rd(ARCHD *arcn, char *buf)
754 * we only get proper sized buffers
756 if (ustar_id(buf, BLKMULT) < 0)
758 memset(arcn, 0, sizeof(*arcn));
759 arcn->org_name = arcn->name;
760 arcn->sb.st_nlink = 1;
761 hd = (HD_USTAR *)buf;
764 * see if the filename is split into two parts. if, so joint the parts.
765 * we copy the prefix first and add a / between the prefix and name.
768 if (*(hd->prefix) != '\0') {
769 cnt = fieldcpy(dest, sizeof(arcn->name) - 1, hd->prefix,
778 if (hd->typeflag != LONGLINKTYPE && hd->typeflag != LONGNAMETYPE) {
779 arcn->nlen = cnt + expandname(dest, sizeof(arcn->name) - cnt,
780 &gnu_name_string, hd->name, sizeof(hd->name));
781 arcn->ln_nlen = expandname(arcn->ln_name, sizeof(arcn->ln_name),
782 &gnu_link_string, hd->linkname, sizeof(hd->linkname));
786 * follow the spec to the letter. we should only have mode bits, strip
787 * off all other crud we may be passed.
789 arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode, sizeof(hd->mode), OCT) &
792 arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
794 arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
796 arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
797 arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
800 * If we can find the ascii names for gname and uname in the password
801 * and group files we will use the uid's and gid they bind. Otherwise
802 * we use the uid and gid values stored in the header. (This is what
803 * the posix spec wants).
805 hd->gname[sizeof(hd->gname) - 1] = '\0';
806 if (gid_name(hd->gname, &(arcn->sb.st_gid)) < 0)
807 arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
808 hd->uname[sizeof(hd->uname) - 1] = '\0';
809 if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0)
810 arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
813 * set the defaults, these may be changed depending on the file type
817 arcn->sb.st_rdev = (dev_t)0;
820 * set the mode and PAX type according to the typeflag in the header
822 switch (hd->typeflag) {
824 arcn->type = PAX_FIF;
825 arcn->sb.st_mode |= S_IFIFO;
828 arcn->type = PAX_DIR;
829 arcn->sb.st_mode |= S_IFDIR;
830 arcn->sb.st_nlink = 2;
833 * Some programs that create ustar archives append a '/'
834 * to the pathname for directories. This clearly violates
835 * ustar specs, but we will silently strip it off anyway.
837 if (arcn->name[arcn->nlen - 1] == '/')
838 arcn->name[--arcn->nlen] = '\0';
843 * this type requires the rdev field to be set.
845 if (hd->typeflag == BLKTYPE) {
846 arcn->type = PAX_BLK;
847 arcn->sb.st_mode |= S_IFBLK;
849 arcn->type = PAX_CHR;
850 arcn->sb.st_mode |= S_IFCHR;
852 devmajor = (dev_t)asc_ul(hd->devmajor,sizeof(hd->devmajor),OCT);
853 devminor = (dev_t)asc_ul(hd->devminor,sizeof(hd->devminor),OCT);
854 arcn->sb.st_rdev = TODEV(devmajor, devminor);
858 if (hd->typeflag == SYMTYPE) {
859 arcn->type = PAX_SLK;
860 arcn->sb.st_mode |= S_IFLNK;
862 arcn->type = PAX_HLK;
864 * so printing looks better
866 arcn->sb.st_mode |= S_IFREG;
867 arcn->sb.st_nlink = 2;
873 * GNU long link/file; we tag these here and let the
874 * pax internals deal with it -- too ugly otherwise.
877 hd->typeflag == LONGLINKTYPE ? PAX_GLL : PAX_GLF;
878 arcn->pad = TAR_PAD(arcn->sb.st_size);
879 arcn->skip = arcn->sb.st_size;
886 * these types have file data that follows. Set the skip and
889 arcn->type = PAX_REG;
890 arcn->pad = TAR_PAD(arcn->sb.st_size);
891 arcn->skip = arcn->sb.st_size;
892 arcn->sb.st_mode |= S_IFREG;
900 * write a ustar header for the file specified in the ARCHD to the archive
901 * Have to check for file types that cannot be stored and file names that
902 * are too long. Be careful of the term (last arg) to ul_oct, we only use
903 * '\0' for the termination character (this is different than picky tar)
904 * ASSUMED: space after header in header block is zero filled
906 * 0 if file has data to be written after the header, 1 if file has NO
907 * data to write after the header, -1 if archive write failed
911 ustar_wr(ARCHD *arcn)
915 char hdblk[sizeof(HD_USTAR)];
918 * check for those file system types ustar cannot store
920 if (arcn->type == PAX_SCK) {
921 paxwarn(1, "Ustar cannot archive a socket %s", arcn->org_name);
926 * check the length of the linkname
928 if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
929 (arcn->type == PAX_HRG)) && (arcn->ln_nlen > sizeof(hd->linkname))){
930 paxwarn(1, "Link name too long for ustar %s", arcn->ln_name);
935 * split the path name into prefix and name fields (if needed). if
936 * pt != arcn->name, the name has to be split
938 if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) {
939 paxwarn(1, "File name too long for ustar %s", arcn->name);
944 * zero out the header so we don't have to worry about zero fill below
946 memset(hdblk, 0, sizeof(hdblk));
947 hd = (HD_USTAR *)hdblk;
951 * split the name, or zero out the prefix
953 if (pt != arcn->name) {
955 * name was split, pt points at the / where the split is to
956 * occur, we remove the / and copy the first part to the prefix
959 fieldcpy(hd->prefix, sizeof(hd->prefix), arcn->name,
965 * copy the name part. this may be the whole path or the part after
968 fieldcpy(hd->name, sizeof(hd->name), pt,
969 sizeof(arcn->name) - (pt - arcn->name));
972 * set the fields in the header that are type dependent
974 switch (arcn->type) {
976 hd->typeflag = DIRTYPE;
977 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
982 if (arcn->type == PAX_CHR)
983 hd->typeflag = CHRTYPE;
985 hd->typeflag = BLKTYPE;
986 if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor,
987 sizeof(hd->devmajor), 3) ||
988 ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor,
989 sizeof(hd->devminor), 3) ||
990 ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
994 hd->typeflag = FIFOTYPE;
995 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
1001 if (arcn->type == PAX_SLK)
1002 hd->typeflag = SYMTYPE;
1004 hd->typeflag = LNKTYPE;
1005 fieldcpy(hd->linkname, sizeof(hd->linkname), arcn->ln_name,
1006 sizeof(arcn->ln_name));
1007 if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
1014 * file data with this type, set the padding
1016 if (arcn->type == PAX_CTG)
1017 hd->typeflag = CONTTYPE;
1019 hd->typeflag = REGTYPE;
1020 arcn->pad = TAR_PAD(arcn->sb.st_size);
1022 if (ul_oct((u_long)arcn->sb.st_size, hd->size,
1023 sizeof(hd->size), 3)) {
1025 if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
1026 sizeof(hd->size), 3)) {
1028 paxwarn(1,"File is too long for ustar %s",arcn->org_name);
1034 strncpy(hd->magic, TMAGIC, TMAGLEN);
1035 strncpy(hd->version, TVERSION, TVERSLEN);
1038 * set the remaining fields. Some versions want all 16 bits of mode
1039 * we better humor them (they really do not meet spec though)....
1041 if (ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3)) {
1042 if (uid_nobody == 0) {
1043 if (uid_name("nobody", &uid_nobody) == -1)
1046 if (uid_warn != arcn->sb.st_uid) {
1047 uid_warn = arcn->sb.st_uid;
1049 "Ustar header field is too small for uid %lu, "
1050 "using nobody", (u_long)arcn->sb.st_uid);
1052 if (ul_oct((u_long)uid_nobody, hd->uid, sizeof(hd->uid), 3))
1055 if (ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3)) {
1056 if (gid_nobody == 0) {
1057 if (gid_name("nobody", &gid_nobody) == -1)
1060 if (gid_warn != arcn->sb.st_gid) {
1061 gid_warn = arcn->sb.st_gid;
1063 "Ustar header field is too small for gid %lu, "
1064 "using nobody", (u_long)arcn->sb.st_gid);
1066 if (ul_oct((u_long)gid_nobody, hd->gid, sizeof(hd->gid), 3))
1069 if (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) ||
1070 ul_oct((u_long)(u_int)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
1072 strncpy(hd->uname, name_uid(arcn->sb.st_uid, 0), sizeof(hd->uname));
1073 strncpy(hd->gname, name_gid(arcn->sb.st_gid, 0), sizeof(hd->gname));
1076 * calculate and store the checksum write the header to the archive
1077 * return 0 tells the caller to now write the file data, 1 says no data
1078 * needs to be written
1080 if (ul_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum,
1081 sizeof(hd->chksum), 3))
1083 if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0)
1085 if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
1087 if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
1093 * header field is out of range
1095 paxwarn(1, "Ustar header field is too small for %s", arcn->org_name);
1101 * see if the name has to be split for storage in a ustar header. We try
1102 * to fit the entire name in the name field without splitting if we can.
1103 * The split point is always at a /
1105 * character pointer to split point (always the / that is to be removed
1106 * if the split is not needed, the points is set to the start of the file
1107 * name (it would violate the spec to split there). A NULL is returned if
1108 * the file name is too long
1112 name_split(char *name, int len)
1117 * check to see if the file name is small enough to fit in the name
1118 * field. if so just return a pointer to the name.
1119 * The strings can fill the complete name and prefix fields
1120 * without a NUL terminator.
1124 if (len > (TPFSZ + TNMSZ + 1))
1128 * we start looking at the biggest sized piece that fits in the name
1129 * field. We walk forward looking for a slash to split at. The idea is
1130 * to find the biggest piece to fit in the name field (or the smallest
1131 * prefix we can find) (the -1 is correct the biggest piece would
1132 * include the slash between the two parts that gets thrown away)
1134 start = name + len - TNMSZ - 1;
1135 while ((*start != '\0') && (*start != '/'))
1139 * if we hit the end of the string, this name cannot be split, so we
1140 * cannot store this file.
1147 * NOTE: /str where the length of str == TNMSZ can not be stored under
1148 * the p1003.1-1990 spec for ustar. We could force a prefix of / and
1149 * the file would then expand on extract to //str. The len == 0 below
1150 * makes this special case follow the spec to the letter.
1152 if ((len > TPFSZ) || (len == 0))
1156 * ok have a split point, return it to the caller
1162 expandname(char *buf, size_t len, char **gnu_name, const char *name,
1168 /* *gnu_name is NUL terminated */
1169 if ((nlen = strlcpy(buf, *gnu_name, len)) >= len)
1174 nlen = fieldcpy(buf, len, name, limit);