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/* $NetBSD: tar.c,v 1.71 2013/01/24 17:43:44 christos Exp $ */
/*-
* Copyright (c) 1992 Keith Muller.
* Copyright (c) 1992, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Keith Muller of the University of California, San Diego.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if !defined(lint)
#if 0
static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94";
#else
__RCSID("$NetBSD: tar.c,v 1.71 2013/01/24 17:43:44 christos Exp $");
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <ctype.h>
#include <errno.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pax.h"
#include "extern.h"
#include "tar.h"
/*
* Routines for reading, writing and header identify of various versions of tar
*/
static int expandname(char *, size_t, char **, size_t *, const char *, size_t);
static void longlink(ARCHD *, int);
static uint32_t tar_chksm(char *, int);
static char *name_split(char *, int);
static int u32_oct(uintmax_t, char *, int, int);
static int umax_oct(uintmax_t, char *, int, int);
static int tar_gnutar_exclude_one(const char *, size_t);
static int check_sum(char *, size_t, char *, size_t, int);
/*
* Routines common to all versions of tar
*/
static int tar_nodir; /* do not write dirs under old tar */
int is_gnutar; /* behave like gnu tar; enable gnu
* extensions and skip end-of-volume
* checks
*/
static int seen_gnu_warning; /* Have we warned yet? */
static char *gnu_hack_string; /* ././@LongLink hackery */
static int gnu_hack_len; /* len of gnu_hack_string */
char *gnu_name_string; /* ././@LongLink hackery name */
char *gnu_link_string; /* ././@LongLink hackery link */
size_t gnu_name_length; /* ././@LongLink hackery name */
size_t gnu_link_length; /* ././@LongLink hackery link */
static int gnu_short_trailer; /* gnu short trailer */
static const char LONG_LINK[] = "././@LongLink";
#ifdef _PAX_
char DEV_0[] = "/dev/rst0";
char DEV_1[] = "/dev/rst1";
char DEV_4[] = "/dev/rst4";
char DEV_5[] = "/dev/rst5";
char DEV_7[] = "/dev/rst7";
char DEV_8[] = "/dev/rst8";
#endif
static int
check_sum(char *hd, size_t hdlen, char *bl, size_t bllen, int quiet)
{
uint32_t hdck, blck;
hdck = asc_u32(hd, hdlen, OCT);
blck = tar_chksm(bl, bllen);
if (hdck != blck) {
if (!quiet)
tty_warn(0, "Header checksum %o does not match %o",
hdck, blck);
return -1;
}
return 0;
}
/*
* tar_endwr()
* add the tar trailer of two null blocks
* Return:
* 0 if ok, -1 otherwise (what wr_skip returns)
*/
int
tar_endwr(void)
{
return wr_skip((off_t)(NULLCNT * BLKMULT));
}
/*
* tar_endrd()
* no cleanup needed here, just return size of trailer (for append)
* Return:
* size of trailer BLKMULT
*/
off_t
tar_endrd(void)
{
return (off_t)((gnu_short_trailer ? 1 : NULLCNT) * BLKMULT);
}
/*
* tar_trail()
* Called to determine if a header block is a valid trailer. We are passed
* the block, the in_sync flag (which tells us we are in resync mode;
* looking for a valid header), and cnt (which starts at zero) which is
* used to count the number of empty blocks we have seen so far.
* Return:
* 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
* could never contain a header.
*/
int
tar_trail(char *buf, int in_resync, int *cnt)
{
int i;
gnu_short_trailer = 0;
/*
* look for all zero, trailer is two consecutive blocks of zero
*/
for (i = 0; i < BLKMULT; ++i) {
if (buf[i] != '\0')
break;
}
/*
* if not all zero it is not a trailer, but MIGHT be a header.
*/
if (i != BLKMULT)
return -1;
/*
* When given a zero block, we must be careful!
* If we are not in resync mode, check for the trailer. Have to watch
* out that we do not mis-identify file data as the trailer, so we do
* NOT try to id a trailer during resync mode. During resync mode we
* might as well throw this block out since a valid header can NEVER be
* a block of all 0 (we must have a valid file name).
*/
if (!in_resync) {
++*cnt;
/*
* old GNU tar (up through 1.13) only writes one block of
* trailers, so we pretend we got another
*/
if (is_gnutar) {
gnu_short_trailer = 1;
++*cnt;
}
if (*cnt >= NULLCNT)
return 0;
}
return 1;
}
/*
* u32_oct()
* convert an uintmax_t to an octal string. many oddball field
* termination characters are used by the various versions of tar in the
* different fields. term selects which kind to use. str is '0' padded
* at the front to len. we are unable to use only one format as many old
* tar readers are very cranky about this.
* Return:
* 0 if the number fit into the string, -1 otherwise
*/
static int
u32_oct(uintmax_t val, char *str, int len, int term)
{
char *pt;
uint64_t p;
p = val & TOP_HALF;
if (p && p != TOP_HALF)
return -1;
val &= BOTTOM_HALF;
/*
* term selects the appropriate character(s) for the end of the string
*/
pt = str + len - 1;
switch(term) {
case 3:
*pt-- = '\0';
break;
case 2:
*pt-- = ' ';
*pt-- = '\0';
break;
case 1:
*pt-- = ' ';
break;
case 0:
default:
*pt-- = '\0';
*pt-- = ' ';
break;
}
/*
* convert and blank pad if there is space
*/
while (pt >= str) {
*pt-- = '0' + (char)(val & 0x7);
if ((val = val >> 3) == 0)
break;
}
while (pt >= str)
*pt-- = '0';
if (val != 0)
return -1;
return 0;
}
/*
* umax_oct()
* convert an unsigned long long to an octal string. one of many oddball
* field termination characters are used by the various versions of tar
* in the different fields. term selects which kind to use. str is '0'
* padded at the front to len. we are unable to use only one format as
* many old tar readers are very cranky about this.
* Return:
* 0 if the number fit into the string, -1 otherwise
*/
static int
umax_oct(uintmax_t val, char *str, int len, int term)
{
char *pt;
/*
* term selects the appropriate character(s) for the end of the string
*/
pt = str + len - 1;
switch(term) {
case 3:
*pt-- = '\0';
break;
case 2:
*pt-- = ' ';
*pt-- = '\0';
break;
case 1:
*pt-- = ' ';
break;
case 0:
default:
*pt-- = '\0';
*pt-- = ' ';
break;
}
/*
* convert and blank pad if there is space
*/
while (pt >= str) {
*pt-- = '0' + (char)(val & 0x7);
if ((val = val >> 3) == 0)
break;
}
while (pt >= str)
*pt-- = '0';
if (val != 0)
return -1;
return 0;
}
/*
* tar_chksm()
* calculate the checksum for a tar block counting the checksum field as
* all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
* NOTE: we use len to short circuit summing 0's on write since we ALWAYS
* pad headers with 0.
* Return:
* unsigned long checksum
*/
static uint32_t
tar_chksm(char *blk, int len)
{
char *stop;
char *pt;
uint32_t chksm = BLNKSUM; /* initial value is checksum field sum */
/*
* add the part of the block before the checksum field
*/
pt = blk;
stop = blk + CHK_OFFSET;
while (pt < stop)
chksm += (uint32_t)(*pt++ & 0xff);
/*
* move past the checksum field and keep going, spec counts the
* checksum field as the sum of 8 blanks (which is pre-computed as
* BLNKSUM).
* ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
* starts, no point in summing zero's)
*/
pt += CHK_LEN;
stop = blk + len;
while (pt < stop)
chksm += (uint32_t)(*pt++ & 0xff);
return chksm;
}
/*
* Routines for old BSD style tar (also made portable to sysV tar)
*/
/*
* tar_id()
* determine if a block given to us is a valid tar header (and not a USTAR
* header). We have to be on the lookout for those pesky blocks of all
* zero's.
* Return:
* 0 if a tar header, -1 otherwise
*/
int
tar_id(char *blk, int size)
{
HD_TAR *hd;
HD_USTAR *uhd;
static int is_ustar = -1;
if (size < BLKMULT)
return -1;
hd = (HD_TAR *)blk;
uhd = (HD_USTAR *)blk;
/*
* check for block of zero's first, a simple and fast test, then make
* sure this is not a ustar header by looking for the ustar magic
* cookie. We should use TMAGLEN, but some USTAR archive programs are
* wrong and create archives missing the \0. Last we check the
* checksum. If this is ok we have to assume it is a valid header.
*/
if (hd->name[0] == '\0')
return -1;
if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0) {
if (is_ustar == -1) {
is_ustar = 1;
return -1;
} else
tty_warn(0,
"Busted tar archive: has both ustar and old tar "
"records");
} else
is_ustar = 0;
return check_sum(hd->chksum, sizeof(hd->chksum), blk, BLKMULT, 1);
}
/*
* tar_opt()
* handle tar format specific -o options
* Return:
* 0 if ok -1 otherwise
*/
int
tar_opt(void)
{
OPLIST *opt;
while ((opt = opt_next()) != NULL) {
if (strcmp(opt->name, TAR_OPTION) ||
strcmp(opt->value, TAR_NODIR)) {
tty_warn(1,
"Unknown tar format -o option/value pair %s=%s",
opt->name, opt->value);
tty_warn(1,
"%s=%s is the only supported tar format option",
TAR_OPTION, TAR_NODIR);
return -1;
}
/*
* we only support one option, and only when writing
*/
if ((act != APPND) && (act != ARCHIVE)) {
tty_warn(1, "%s=%s is only supported when writing.",
opt->name, opt->value);
return -1;
}
tar_nodir = 1;
}
return 0;
}
/*
* tar_rd()
* extract the values out of block already determined to be a tar header.
* store the values in the ARCHD parameter.
* Return:
* 0
*/
int
tar_rd(ARCHD *arcn, char *buf)
{
HD_TAR *hd;
char *pt;
/*
* we only get proper sized buffers passed to us
*/
if (tar_id(buf, BLKMULT) < 0)
return -1;
memset(arcn, 0, sizeof(*arcn));
arcn->org_name = arcn->name;
arcn->pat = NULL;
arcn->sb.st_nlink = 1;
/*
* copy out the name and values in the stat buffer
*/
hd = (HD_TAR *)buf;
if (hd->linkflag != LONGLINKTYPE && hd->linkflag != LONGNAMETYPE) {
arcn->nlen = expandname(arcn->name, sizeof(arcn->name),
&gnu_name_string, &gnu_name_length, hd->name,
sizeof(hd->name));
arcn->ln_nlen = expandname(arcn->ln_name, sizeof(arcn->ln_name),
&gnu_link_string, &gnu_link_length, hd->linkname,
sizeof(hd->linkname));
}
arcn->sb.st_mode = (mode_t)(asc_u32(hd->mode,sizeof(hd->mode),OCT) &
0xfff);
arcn->sb.st_uid = (uid_t)asc_u32(hd->uid, sizeof(hd->uid), OCT);
arcn->sb.st_gid = (gid_t)asc_u32(hd->gid, sizeof(hd->gid), OCT);
arcn->sb.st_size = (off_t)ASC_OFFT(hd->size, sizeof(hd->size), OCT);
arcn->sb.st_mtime = (time_t)(int32_t)asc_u32(hd->mtime, sizeof(hd->mtime), OCT);
arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
/*
* have to look at the last character, it may be a '/' and that is used
* to encode this as a directory
*/
pt = &(arcn->name[arcn->nlen - 1]);
arcn->pad = 0;
arcn->skip = 0;
switch(hd->linkflag) {
case SYMTYPE:
/*
* symbolic link, need to get the link name and set the type in
* the st_mode so -v printing will look correct.
*/
arcn->type = PAX_SLK;
arcn->sb.st_mode |= S_IFLNK;
break;
case LNKTYPE:
/*
* hard link, need to get the link name, set the type in the
* st_mode and st_nlink so -v printing will look better.
*/
arcn->type = PAX_HLK;
arcn->sb.st_nlink = 2;
/*
* no idea of what type this thing really points at, but
* we set something for printing only.
*/
arcn->sb.st_mode |= S_IFREG;
break;
case LONGLINKTYPE:
case LONGNAMETYPE:
/*
* GNU long link/file; we tag these here and let the
* pax internals deal with it -- too ugly otherwise.
*/
if (hd->linkflag != LONGLINKTYPE)
arcn->type = PAX_GLF;
else
arcn->type = PAX_GLL;
arcn->pad = TAR_PAD(arcn->sb.st_size);
arcn->skip = arcn->sb.st_size;
break;
case AREGTYPE:
case REGTYPE:
case DIRTYPE: /* see below */
default:
/*
* If we have a trailing / this is a directory and NOT a file.
* Note: V7 tar doesn't actually have DIRTYPE, but it was
* reported that V7 archives using USTAR directories do exist.
*/
if (*pt == '/' || hd->linkflag == DIRTYPE) {
/*
* it is a directory, set the mode for -v printing
*/
arcn->type = PAX_DIR;
arcn->sb.st_mode |= S_IFDIR;
arcn->sb.st_nlink = 2;
} else {
/*
* have a file that will be followed by data. Set the
* skip value to the size field and calculate the size
* of the padding.
*/
arcn->type = PAX_REG;
arcn->sb.st_mode |= S_IFREG;
arcn->pad = TAR_PAD(arcn->sb.st_size);
arcn->skip = arcn->sb.st_size;
}
break;
}
/*
* strip off any trailing slash.
*/
if (*pt == '/') {
*pt = '\0';
--arcn->nlen;
}
return 0;
}
/*
* tar_wr()
* write a tar header for the file specified in the ARCHD to the archive.
* Have to check for file types that cannot be stored and file names that
* are too long. Be careful of the term (last arg) to u32_oct, each field
* of tar has it own spec for the termination character(s).
* ASSUMED: space after header in header block is zero filled
* Return:
* 0 if file has data to be written after the header, 1 if file has NO
* data to write after the header, -1 if archive write failed
*/
int
tar_wr(ARCHD *arcn)
{
HD_TAR *hd;
int len;
char hdblk[sizeof(HD_TAR)];
/*
* check for those file system types which tar cannot store
*/
switch(arcn->type) {
case PAX_DIR:
/*
* user asked that dirs not be written to the archive
*/
if (tar_nodir)
return 1;
break;
case PAX_CHR:
tty_warn(1, "Tar cannot archive a character device %s",
arcn->org_name);
return 1;
case PAX_BLK:
tty_warn(1,
"Tar cannot archive a block device %s", arcn->org_name);
return 1;
case PAX_SCK:
tty_warn(1, "Tar cannot archive a socket %s", arcn->org_name);
return 1;
case PAX_FIF:
tty_warn(1, "Tar cannot archive a fifo %s", arcn->org_name);
return 1;
case PAX_SLK:
case PAX_HLK:
case PAX_HRG:
if (arcn->ln_nlen > (int)sizeof(hd->linkname)) {
tty_warn(1,"Link name too long for tar %s",
arcn->ln_name);
return 1;
}
break;
case PAX_REG:
case PAX_CTG:
default:
break;
}
/*
* check file name len, remember extra char for dirs (the / at the end)
*/
len = arcn->nlen;
if (arcn->type == PAX_DIR)
++len;
if (len >= (int)sizeof(hd->name)) {
tty_warn(1, "File name too long for tar %s", arcn->name);
return 1;
}
/*
* copy the data out of the ARCHD into the tar header based on the type
* of the file. Remember many tar readers want the unused fields to be
* padded with zero. We set the linkflag field (type), the linkname
* (or zero if not used),the size, and set the padding (if any) to be
* added after the file data (0 for all other types, as they only have
* a header)
*/
memset(hdblk, 0, sizeof(hdblk));
hd = (HD_TAR *)hdblk;
strlcpy(hd->name, arcn->name, sizeof(hd->name));
arcn->pad = 0;
if (arcn->type == PAX_DIR) {
/*
* directories are the same as files, except have a filename
* that ends with a /, we add the slash here. No data follows,
* dirs, so no pad.
*/
hd->linkflag = AREGTYPE;
hd->name[len-1] = '/';
if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 1))
goto out;
} else if (arcn->type == PAX_SLK) {
/*
* no data follows this file, so no pad
*/
hd->linkflag = SYMTYPE;
strlcpy(hd->linkname, arcn->ln_name, sizeof(hd->linkname));
if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 1))
goto out;
} else if ((arcn->type == PAX_HLK) || (arcn->type == PAX_HRG)) {
/*
* no data follows this file, so no pad
*/
hd->linkflag = LNKTYPE;
strlcpy(hd->linkname, arcn->ln_name, sizeof(hd->linkname));
if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 1))
goto out;
} else {
/*
* data follows this file, so set the pad
*/
hd->linkflag = AREGTYPE;
if (OFFT_OCT(arcn->sb.st_size, hd->size, sizeof(hd->size), 1)) {
tty_warn(1,"File is too large for tar %s",
arcn->org_name);
return 1;
}
arcn->pad = TAR_PAD(arcn->sb.st_size);
}
/*
* copy those fields that are independent of the type
*/
if (u32_oct((uintmax_t)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
u32_oct((uintmax_t)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
u32_oct((uintmax_t)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
u32_oct((uintmax_t)arcn->sb.st_mtime, hd->mtime, sizeof(hd->mtime), 1))
goto out;
/*
* calculate and add the checksum, then write the header. A return of
* 0 tells the caller to now write the file data, 1 says no data needs
* to be written
*/
if (u32_oct(tar_chksm(hdblk, sizeof(HD_TAR)), hd->chksum,
sizeof(hd->chksum), 3))
goto out; /* XXX Something's wrong here
* because a zero-byte file can
* cause this to be done and
* yet the resulting warning
* seems incorrect */
if (wr_rdbuf(hdblk, sizeof(HD_TAR)) < 0)
return -1;
if (wr_skip((off_t)(BLKMULT - sizeof(HD_TAR))) < 0)
return -1;
if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
return 0;
return 1;
out:
/*
* header field is out of range
*/
tty_warn(1, "Tar header field is too small for %s", arcn->org_name);
return 1;
}
/*
* Routines for POSIX ustar
*/
/*
* ustar_strd()
* initialization for ustar read
* Return:
* 0 if ok, -1 otherwise
*/
int
ustar_strd(void)
{
return 0;
}
/*
* ustar_stwr()
* initialization for ustar write
* Return:
* 0 if ok, -1 otherwise
*/
int
ustar_stwr(void)
{
return 0;
}
/*
* ustar_id()
* determine if a block given to us is a valid ustar header. We have to
* be on the lookout for those pesky blocks of all zero's
* Return:
* 0 if a ustar header, -1 otherwise
*/
int
ustar_id(char *blk, int size)
{
HD_USTAR *hd;
if (size < BLKMULT)
return -1;
hd = (HD_USTAR *)blk;
/*
* check for block of zero's first, a simple and fast test then check
* ustar magic cookie. We should use TMAGLEN, but some USTAR archive
* programs are fouled up and create archives missing the \0. Last we
* check the checksum. If ok we have to assume it is a valid header.
*/
if (hd->name[0] == '\0')
return -1;
if (strncmp(hd->magic, TMAGIC, TMAGLEN - 1) != 0)
return -1;
/* This is GNU tar */
if (strncmp(hd->magic, "ustar ", 8) == 0 && !is_gnutar &&
!seen_gnu_warning) {
seen_gnu_warning = 1;
tty_warn(0,
"Trying to read GNU tar archive with GNU extensions and end-of-volume checks off");
}
return check_sum(hd->chksum, sizeof(hd->chksum), blk, BLKMULT, 0);
}
/*
* ustar_rd()
* extract the values out of block already determined to be a ustar header.
* store the values in the ARCHD parameter.
* Return:
* 0
*/
int
ustar_rd(ARCHD *arcn, char *buf)
{
HD_USTAR *hd;
char *dest;
int cnt;
dev_t devmajor;
dev_t devminor;
/*
* we only get proper sized buffers
*/
if (ustar_id(buf, BLKMULT) < 0)
return -1;
memset(arcn, 0, sizeof(*arcn));
arcn->org_name = arcn->name;
arcn->pat = NULL;
arcn->sb.st_nlink = 1;
hd = (HD_USTAR *)buf;
/*
* see if the filename is split into two parts. if, so joint the parts.
* we copy the prefix first and add a / between the prefix and name.
*/
dest = arcn->name;
if (*(hd->prefix) != '\0') {
cnt = strlcpy(arcn->name, hd->prefix, sizeof(arcn->name));
dest += cnt;
*dest++ = '/';
cnt++;
} else {
cnt = 0;
}
if (hd->typeflag != LONGLINKTYPE && hd->typeflag != LONGNAMETYPE) {
arcn->nlen = expandname(dest, sizeof(arcn->name) - cnt,
&gnu_name_string, &gnu_name_length, hd->name,
sizeof(hd->name)) + cnt;
arcn->ln_nlen = expandname(arcn->ln_name,
sizeof(arcn->ln_name), &gnu_link_string, &gnu_link_length,
hd->linkname, sizeof(hd->linkname));
}
/*
* follow the spec to the letter. we should only have mode bits, strip
* off all other crud we may be passed.
*/
arcn->sb.st_mode = (mode_t)(asc_u32(hd->mode, sizeof(hd->mode), OCT) &
0xfff);
arcn->sb.st_size = (off_t)ASC_OFFT(hd->size, sizeof(hd->size), OCT);
arcn->sb.st_mtime = (time_t)(int32_t)asc_u32(hd->mtime, sizeof(hd->mtime), OCT);
arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
/*
* If we can find the ascii names for gname and uname in the password
* and group files we will use the uid's and gid they bind. Otherwise
* we use the uid and gid values stored in the header. (This is what
* the posix spec wants).
*/
hd->gname[sizeof(hd->gname) - 1] = '\0';
if (gid_from_group(hd->gname, &(arcn->sb.st_gid)) < 0)
arcn->sb.st_gid = (gid_t)asc_u32(hd->gid, sizeof(hd->gid), OCT);
hd->uname[sizeof(hd->uname) - 1] = '\0';
if (uid_from_user(hd->uname, &(arcn->sb.st_uid)) < 0)
arcn->sb.st_uid = (uid_t)asc_u32(hd->uid, sizeof(hd->uid), OCT);
/*
* set the defaults, these may be changed depending on the file type
*/
arcn->pad = 0;
arcn->skip = 0;
arcn->sb.st_rdev = (dev_t)0;
/*
* set the mode and PAX type according to the typeflag in the header
*/
switch(hd->typeflag) {
case FIFOTYPE:
arcn->type = PAX_FIF;
arcn->sb.st_mode |= S_IFIFO;
break;
case DIRTYPE:
arcn->type = PAX_DIR;
arcn->sb.st_mode |= S_IFDIR;
arcn->sb.st_nlink = 2;
/*
* Some programs that create ustar archives append a '/'
* to the pathname for directories. This clearly violates
* ustar specs, but we will silently strip it off anyway.
*/
if (arcn->name[arcn->nlen - 1] == '/')
arcn->name[--arcn->nlen] = '\0';
break;
case BLKTYPE:
case CHRTYPE:
/*
* this type requires the rdev field to be set.
*/
if (hd->typeflag == BLKTYPE) {
arcn->type = PAX_BLK;
arcn->sb.st_mode |= S_IFBLK;
} else {
arcn->type = PAX_CHR;
arcn->sb.st_mode |= S_IFCHR;
}
devmajor = (dev_t)asc_u32(hd->devmajor,sizeof(hd->devmajor),OCT);
devminor = (dev_t)asc_u32(hd->devminor,sizeof(hd->devminor),OCT);
arcn->sb.st_rdev = TODEV(devmajor, devminor);
break;
case SYMTYPE:
case LNKTYPE:
if (hd->typeflag == SYMTYPE) {
arcn->type = PAX_SLK;
arcn->sb.st_mode |= S_IFLNK;
} else {
arcn->type = PAX_HLK;
/*
* so printing looks better
*/
arcn->sb.st_mode |= S_IFREG;
arcn->sb.st_nlink = 2;
}
break;
case LONGLINKTYPE:
case LONGNAMETYPE:
if (is_gnutar) {
/*
* GNU long link/file; we tag these here and let the
* pax internals deal with it -- too ugly otherwise.
*/
if (hd->typeflag != LONGLINKTYPE)
arcn->type = PAX_GLF;
else
arcn->type = PAX_GLL;
arcn->pad = TAR_PAD(arcn->sb.st_size);
arcn->skip = arcn->sb.st_size;
} else {
tty_warn(1, "GNU Long %s found in posix ustar archive.",
hd->typeflag == LONGLINKTYPE ? "Link" : "File");
}
break;
case FILEXTYPE:
case GLOBXTYPE:
tty_warn(0, "%s extended headers posix ustar archive."
" Extracting as plain files. Following files might be"
" in the wrong directory or have wrong attributes.",
hd->typeflag == FILEXTYPE ? "File" : "Global");
/*FALLTHROUGH*/
case CONTTYPE:
case AREGTYPE:
case REGTYPE:
default:
/*
* these types have file data that follows. Set the skip and
* pad fields.
*/
arcn->type = PAX_REG;
arcn->pad = TAR_PAD(arcn->sb.st_size);
arcn->skip = arcn->sb.st_size;
arcn->sb.st_mode |= S_IFREG;
break;
}
return 0;
}
static int
expandname(char *buf, size_t len, char **gnu_name, size_t *gnu_length,
const char *name, size_t nlen)
{
if (*gnu_name) {
len = strlcpy(buf, *gnu_name, len);
free(*gnu_name);
*gnu_name = NULL;
*gnu_length = 0;
} else {
if (len > ++nlen)
len = nlen;
len = strlcpy(buf, name, len);
}
return len;
}
static void
longlink(ARCHD *arcn, int type)
{
ARCHD larc;
(void)memset(&larc, 0, sizeof(larc));
larc.type = type;
larc.nlen = strlcpy(larc.name, LONG_LINK, sizeof(larc.name));
switch (type) {
case PAX_GLL:
gnu_hack_string = arcn->ln_name;
gnu_hack_len = arcn->ln_nlen + 1;
break;
case PAX_GLF:
gnu_hack_string = arcn->name;
gnu_hack_len = arcn->nlen + 1;
break;
default:
errx(1, "Invalid type in GNU longlink %d\n", type);
}
/*
* We need a longlink now.
*/
ustar_wr(&larc);
}
/*
* ustar_wr()
* write a ustar header for the file specified in the ARCHD to the archive
* Have to check for file types that cannot be stored and file names that
* are too long. Be careful of the term (last arg) to u32_oct, we only use
* '\0' for the termination character (this is different than picky tar)
* ASSUMED: space after header in header block is zero filled
* Return:
* 0 if file has data to be written after the header, 1 if file has NO
* data to write after the header, -1 if archive write failed
*/
static int
size_err(const char *what, ARCHD *arcn)
{
/*
* header field is out of range
*/
tty_warn(1, "Ustar %s header field is too small for %s",
what, arcn->org_name);
return 1;
}
int
ustar_wr(ARCHD *arcn)
{
HD_USTAR *hd;
char *pt;
char hdblk[sizeof(HD_USTAR)];
const char *user, *group;
switch (arcn->type) {
case PAX_SCK:
/*
* check for those file system types ustar cannot store
*/
if (!is_gnutar)
tty_warn(1, "Ustar cannot archive a socket %s",
arcn->org_name);
return 1;
case PAX_SLK:
case PAX_HLK:
case PAX_HRG:
/*
* check the length of the linkname
*/
if (arcn->ln_nlen >= (int)sizeof(hd->linkname)) {
if (is_gnutar) {
longlink(arcn, PAX_GLL);
} else {
tty_warn(1, "Link name too long for ustar %s",
arcn->ln_name);
return 1;
}
}
break;
default:
break;
}
/*
* split the path name into prefix and name fields (if needed). if
* pt != arcn->name, the name has to be split
*/
if ((pt = name_split(arcn->name, arcn->nlen)) == NULL) {
if (is_gnutar) {
longlink(arcn, PAX_GLF);
pt = arcn->name;
} else {
tty_warn(1, "File name too long for ustar %s",
arcn->name);
return 1;
}
}
/*
* zero out the header so we don't have to worry about zero fill below
*/
memset(hdblk, 0, sizeof(hdblk));
hd = (HD_USTAR *)hdblk;
arcn->pad = 0L;
/*
* split the name, or zero out the prefix
*/
if (pt != arcn->name) {
/*
* name was split, pt points at the / where the split is to
* occur, we remove the / and copy the first part to the prefix
*/
*pt = '\0';
strlcpy(hd->prefix, arcn->name, sizeof(hd->prefix));
*pt++ = '/';
}
/*
* copy the name part. this may be the whole path or the part after
* the prefix
*/
strlcpy(hd->name, pt, sizeof(hd->name));
/*
* set the fields in the header that are type dependent
*/
switch(arcn->type) {
case PAX_DIR:
hd->typeflag = DIRTYPE;
if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 3))
return size_err("DIRTYPE", arcn);
break;
case PAX_CHR:
case PAX_BLK:
if (arcn->type == PAX_CHR)
hd->typeflag = CHRTYPE;
else
hd->typeflag = BLKTYPE;
if (u32_oct((uintmax_t)MAJOR(arcn->sb.st_rdev), hd->devmajor,
sizeof(hd->devmajor), 3) ||
u32_oct((uintmax_t)MINOR(arcn->sb.st_rdev), hd->devminor,
sizeof(hd->devminor), 3) ||
u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 3))
return size_err("DEVTYPE", arcn);
break;
case PAX_FIF:
hd->typeflag = FIFOTYPE;
if (u32_oct((uintmax_t)0L, hd->size, sizeof(hd->size), 3))
return size_err("FIFOTYPE", arcn);
break;
case PAX_GLL:
case PAX_SLK:
case PAX_HLK:
case PAX_HRG:
if (arcn->type == PAX_SLK)
hd->typeflag = SYMTYPE;
else if (arcn->type == PAX_GLL)
hd->typeflag = LONGLINKTYPE;
else
hd->typeflag = LNKTYPE;
strlcpy(hd->linkname, arcn->ln_name, sizeof(hd->linkname));
if (u32_oct((uintmax_t)gnu_hack_len, hd->size,
sizeof(hd->size), 3))
return size_err("LINKTYPE", arcn);
break;
case PAX_GLF:
case PAX_REG:
case PAX_CTG:
default:
/*
* file data with this type, set the padding
*/
if (arcn->type == PAX_GLF) {
hd->typeflag = LONGNAMETYPE;
arcn->pad = TAR_PAD(gnu_hack_len);
if (OFFT_OCT((uint32_t)gnu_hack_len, hd->size,
sizeof(hd->size), 3)) {
tty_warn(1,"File is too long for ustar %s",
arcn->org_name);
return 1;
}
} else {
if (arcn->type == PAX_CTG)
hd->typeflag = CONTTYPE;
else
hd->typeflag = REGTYPE;
arcn->pad = TAR_PAD(arcn->sb.st_size);
if (OFFT_OCT(arcn->sb.st_size, hd->size,
sizeof(hd->size), 3)) {
tty_warn(1,"File is too long for ustar %s",
arcn->org_name);
return 1;
}
}
break;
}
strncpy(hd->magic, TMAGIC, TMAGLEN);
if (is_gnutar)
hd->magic[TMAGLEN - 1] = hd->version[0] = ' ';
else
strncpy(hd->version, TVERSION, TVERSLEN);
/*
* set the remaining fields. Some versions want all 16 bits of mode
* we better humor them (they really do not meet spec though)....
*/
if (u32_oct((uintmax_t)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3))
return size_err("MODE", arcn);
if (u32_oct((uintmax_t)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3))
return size_err("UID", arcn);
if (u32_oct((uintmax_t)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3))
return size_err("GID", arcn);
if (u32_oct((uintmax_t)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
return size_err("MTIME", arcn);
user = user_from_uid(arcn->sb.st_uid, 1);
group = group_from_gid(arcn->sb.st_gid, 1);
strncpy(hd->uname, user ? user : "", sizeof(hd->uname));
strncpy(hd->gname, group ? group : "", sizeof(hd->gname));
/*
* calculate and store the checksum write the header to the archive
* return 0 tells the caller to now write the file data, 1 says no data
* needs to be written
*/
if (u32_oct(tar_chksm(hdblk, sizeof(HD_USTAR)), hd->chksum,
sizeof(hd->chksum), 3))
return size_err("CHKSUM", arcn);
if (wr_rdbuf(hdblk, sizeof(HD_USTAR)) < 0)
return -1;
if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
return -1;
if (gnu_hack_string) {
int res = wr_rdbuf(gnu_hack_string, gnu_hack_len);
int pad = gnu_hack_len;
gnu_hack_string = NULL;
gnu_hack_len = 0;
if (res < 0)
return -1;
if (wr_skip((off_t)(BLKMULT - (pad % BLKMULT))) < 0)
return -1;
}
if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
return 0;
return 1;
}
/*
* name_split()
* see if the name has to be split for storage in a ustar header. We try
* to fit the entire name in the name field without splitting if we can.
* The split point is always at a /
* Return
* character pointer to split point (always the / that is to be removed
* if the split is not needed, the points is set to the start of the file
* name (it would violate the spec to split there). A NULL is returned if
* the file name is too long
*/
static char *
name_split(char *name, int len)
{
char *start;
/*
* check to see if the file name is small enough to fit in the name
* field. if so just return a pointer to the name.
*/
if (len < TNMSZ)
return name;
/*
* GNU tar does not honor the prefix+name mode if the magic
* is not "ustar\0". So in GNU tar compatibility mode, we don't
* split the filename into prefix+name because we are setting
* the magic to "ustar " as GNU tar does. This of course will
* end up creating a LongLink record in cases where it does not
* really need do, but we are behaving like GNU tar after all.
*/
if (is_gnutar || len > (TPFSZ + TNMSZ))
return NULL;
/*
* we start looking at the biggest sized piece that fits in the name
* field. We walk forward looking for a slash to split at. The idea is
* to find the biggest piece to fit in the name field (or the smallest
* prefix we can find) (the -1 is correct the biggest piece would
* include the slash between the two parts that gets thrown away)
*/
start = name + len - TNMSZ;
while ((*start != '\0') && (*start != '/'))
++start;
/*
* if we hit the end of the string, this name cannot be split, so we
* cannot store this file.
*/
if (*start == '\0')
return NULL;
len = start - name;
/*
* NOTE: /str where the length of str == TNMSZ cannot be stored under
* the p1003.1-1990 spec for ustar. We could force a prefix of / and
* the file would then expand on extract to //str. The len == 0 below
* makes this special case follow the spec to the letter.
*/
if ((len >= TPFSZ) || (len == 0))
return NULL;
/*
* ok have a split point, return it to the caller
*/
return start;
}
/*
* convert a glob into a RE, and add it to the list. we convert to
* four different RE's (because we're using BRE's and can't use |
* alternation :-() with this padding:
* .*\/ and $
* .*\/ and \/.*
* ^ and $
* ^ and \/.*
*/
static int
tar_gnutar_exclude_one(const char *line, size_t len)
{
/* 2 * buffer len + nul */
char sbuf[MAXPATHLEN * 2 + 1];
/* + / + // + .*""/\/ + \/.* */
char rabuf[MAXPATHLEN * 2 + 1 + 1 + 2 + 4 + 4];
size_t i;
int j = 0;
if (line[len - 1] == '\n')
len--;
for (i = 0; i < len; i++) {
/*
* convert glob to regexp, escaping everything
*/
if (line[i] == '*')
sbuf[j++] = '.';
else if (line[i] == '?') {
sbuf[j++] = '.';
continue;
} else if (!isalnum((unsigned char)line[i]) &&
!isblank((unsigned char)line[i]))
sbuf[j++] = '\\';
sbuf[j++] = line[i];
}
sbuf[j] = '\0';
/* don't need the .*\/ ones if we start with /, i guess */
if (line[0] != '/') {
(void)snprintf(rabuf, sizeof rabuf, "/.*\\/%s$//", sbuf);
if (rep_add(rabuf) < 0)
return (-1);
(void)snprintf(rabuf, sizeof rabuf, "/.*\\/%s\\/.*//", sbuf);
if (rep_add(rabuf) < 0)
return (-1);
}
(void)snprintf(rabuf, sizeof rabuf, "/^%s$//", sbuf);
if (rep_add(rabuf) < 0)
return (-1);
(void)snprintf(rabuf, sizeof rabuf, "/^%s\\/.*//", sbuf);
if (rep_add(rabuf) < 0)
return (-1);
return (0);
}
/*
* deal with GNU tar -X/--exclude-from & --exclude switchs. basically,
* we go through each line of the file, building a string from the "glob"
* lines in the file into RE lines, of the form `/^RE$//', which we pass
* to rep_add(), which will add a empty replacement (exclusion), for the
* named files.
*/
int
tar_gnutar_minus_minus_exclude(const char *path)
{
size_t len = strlen(path);
if (len > MAXPATHLEN)
tty_warn(0, "pathname too long: %s", path);
return (tar_gnutar_exclude_one(path, len));
}
int
tar_gnutar_X_compat(const char *path)
{
char *line;
FILE *fp;
int lineno = 0;
size_t len;
if (path[0] == '-' && path[1] == '\0')
fp = stdin;
else {
fp = fopen(path, "r");
if (fp == NULL) {
tty_warn(1, "cannot open %s: %s", path,
strerror(errno));
return -1;
}
}
while ((line = fgetln(fp, &len))) {
lineno++;
if (len > MAXPATHLEN) {
tty_warn(0, "pathname too long, line %d of %s",
lineno, path);
}
if (tar_gnutar_exclude_one(line, len))
return -1;
}
if (fp != stdin)
fclose(fp);
return 0;
}
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