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1124 lines
29 KiB
C
1124 lines
29 KiB
C
/*-
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* Copyright (c) 1992 Keith Muller.
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Keith Muller of the University of California, San Diego.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)tar.c 8.2 (Berkeley) 4/18/94";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include "pax.h"
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#include "extern.h"
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#include "tar.h"
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/*
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* Routines for reading, writing and header identify of various versions of tar
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*/
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static u_long tar_chksm(char *, int);
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static char *name_split(char *, int);
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static int ul_oct(u_long, char *, int, int);
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#ifndef NET2_STAT
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static int uqd_oct(u_quad_t, char *, int, int);
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#endif
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/*
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* Routines common to all versions of tar
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*/
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static int tar_nodir; /* do not write dirs under old tar */
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/*
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* tar_endwr()
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* add the tar trailer of two null blocks
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* Return:
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* 0 if ok, -1 otherwise (what wr_skip returns)
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*/
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int
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tar_endwr(void)
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{
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return(wr_skip((off_t)(NULLCNT*BLKMULT)));
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}
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/*
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* tar_endrd()
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* no cleanup needed here, just return size of trailer (for append)
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* Return:
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* size of trailer (2 * BLKMULT)
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*/
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off_t
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tar_endrd(void)
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{
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return((off_t)(NULLCNT*BLKMULT));
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}
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/*
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* tar_trail()
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* Called to determine if a header block is a valid trailer. We are passed
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* the block, the in_sync flag (which tells us we are in resync mode;
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* looking for a valid header), and cnt (which starts at zero) which is
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* used to count the number of empty blocks we have seen so far.
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* Return:
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* 0 if a valid trailer, -1 if not a valid trailer, or 1 if the block
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* could never contain a header.
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*/
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int
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tar_trail(char *buf, int in_resync, int *cnt)
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{
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int i;
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/*
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* look for all zero, trailer is two consecutive blocks of zero
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*/
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for (i = 0; i < BLKMULT; ++i) {
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if (buf[i] != '\0')
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break;
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}
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/*
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* if not all zero it is not a trailer, but MIGHT be a header.
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*/
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if (i != BLKMULT)
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return(-1);
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/*
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* When given a zero block, we must be careful!
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* If we are not in resync mode, check for the trailer. Have to watch
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* out that we do not mis-identify file data as the trailer, so we do
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* NOT try to id a trailer during resync mode. During resync mode we
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* might as well throw this block out since a valid header can NEVER be
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* a block of all 0 (we must have a valid file name).
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*/
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if (!in_resync && (++*cnt >= NULLCNT))
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return(0);
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return(1);
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}
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/*
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* ul_oct()
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* convert an unsigned long to an octal string. many oddball field
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* termination characters are used by the various versions of tar in the
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* different fields. term selects which kind to use. str is '0' padded
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* at the front to len. we are unable to use only one format as many old
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* tar readers are very cranky about this.
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* Return:
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* 0 if the number fit into the string, -1 otherwise
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*/
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static int
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ul_oct(u_long val, char *str, int len, int term)
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{
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char *pt;
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/*
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* term selects the appropriate character(s) for the end of the string
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*/
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pt = str + len - 1;
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switch(term) {
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case 3:
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*pt-- = '\0';
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break;
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case 2:
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*pt-- = ' ';
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*pt-- = '\0';
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break;
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case 1:
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*pt-- = ' ';
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break;
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case 0:
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default:
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*pt-- = '\0';
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*pt-- = ' ';
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break;
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}
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/*
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* convert and blank pad if there is space
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*/
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while (pt >= str) {
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*pt-- = '0' + (char)(val & 0x7);
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if ((val = val >> 3) == (u_long)0)
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break;
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}
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while (pt >= str)
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*pt-- = '0';
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if (val != (u_long)0)
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return(-1);
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return(0);
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}
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#ifndef NET2_STAT
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/*
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* uqd_oct()
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* convert an u_quad_t to an octal string. one of many oddball field
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* termination characters are used by the various versions of tar in the
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* different fields. term selects which kind to use. str is '0' padded
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* at the front to len. we are unable to use only one format as many old
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* tar readers are very cranky about this.
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* Return:
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* 0 if the number fit into the string, -1 otherwise
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*/
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static int
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uqd_oct(u_quad_t val, char *str, int len, int term)
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{
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char *pt;
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/*
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* term selects the appropriate character(s) for the end of the string
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*/
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pt = str + len - 1;
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switch(term) {
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case 3:
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*pt-- = '\0';
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break;
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case 2:
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*pt-- = ' ';
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*pt-- = '\0';
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break;
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case 1:
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*pt-- = ' ';
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break;
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case 0:
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default:
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*pt-- = '\0';
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*pt-- = ' ';
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break;
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}
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/*
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* convert and blank pad if there is space
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*/
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while (pt >= str) {
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*pt-- = '0' + (char)(val & 0x7);
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if ((val = val >> 3) == 0)
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break;
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}
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while (pt >= str)
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*pt-- = '0';
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if (val != (u_quad_t)0)
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return(-1);
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return(0);
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}
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#endif
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/*
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* tar_chksm()
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* calculate the checksum for a tar block counting the checksum field as
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* all blanks (BLNKSUM is that value pre-calculated, the sum of 8 blanks).
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* NOTE: we use len to short circuit summing 0's on write since we ALWAYS
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* pad headers with 0.
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* Return:
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* unsigned long checksum
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*/
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static u_long
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tar_chksm(char *blk, int len)
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{
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char *stop;
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char *pt;
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u_long chksm = BLNKSUM; /* initial value is checksum field sum */
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/*
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* add the part of the block before the checksum field
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*/
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pt = blk;
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stop = blk + CHK_OFFSET;
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while (pt < stop)
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chksm += (u_long)(*pt++ & 0xff);
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/*
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* move past the checksum field and keep going, spec counts the
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* checksum field as the sum of 8 blanks (which is pre-computed as
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* BLNKSUM).
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* ASSUMED: len is greater than CHK_OFFSET. (len is where our 0 padding
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* starts, no point in summing zero's)
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*/
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pt += CHK_LEN;
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stop = blk + len;
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while (pt < stop)
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chksm += (u_long)(*pt++ & 0xff);
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return(chksm);
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}
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/*
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* Routines for old BSD style tar (also made portable to sysV tar)
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*/
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/*
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* tar_id()
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* determine if a block given to us is a valid tar header (and not a USTAR
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* header). We have to be on the lookout for those pesky blocks of all
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* zero's.
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* Return:
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* 0 if a tar header, -1 otherwise
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*/
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int
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tar_id(char *blk, int size)
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{
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HD_TAR *hd;
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HD_USTAR *uhd;
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if (size < BLKMULT)
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return(-1);
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hd = (HD_TAR *)blk;
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uhd = (HD_USTAR *)blk;
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/*
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* check for block of zero's first, a simple and fast test, then make
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* sure this is not a ustar header by looking for the ustar magic
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* cookie. We should use TMAGLEN, but some USTAR archive programs are
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* wrong and create archives missing the \0. Last we check the
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* checksum. If this is ok we have to assume it is a valid header.
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*/
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if (hd->name[0] == '\0')
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return(-1);
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if (strncmp(uhd->magic, TMAGIC, TMAGLEN - 1) == 0)
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return(-1);
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if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
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return(-1);
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return(0);
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}
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/*
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* tar_opt()
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* handle tar format specific -o options
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* Return:
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* 0 if ok -1 otherwise
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*/
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int
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tar_opt(void)
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{
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OPLIST *opt;
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while ((opt = opt_next()) != NULL) {
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if (strcmp(opt->name, TAR_OPTION) ||
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strcmp(opt->value, TAR_NODIR)) {
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paxwarn(1, "Unknown tar format -o option/value pair %s=%s",
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opt->name, opt->value);
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paxwarn(1,"%s=%s is the only supported tar format option",
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TAR_OPTION, TAR_NODIR);
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return(-1);
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}
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/*
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* we only support one option, and only when writing
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*/
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if ((act != APPND) && (act != ARCHIVE)) {
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paxwarn(1, "%s=%s is only supported when writing.",
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opt->name, opt->value);
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return(-1);
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}
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tar_nodir = 1;
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}
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return(0);
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}
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/*
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* tar_rd()
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* extract the values out of block already determined to be a tar header.
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* store the values in the ARCHD parameter.
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* Return:
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* 0
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*/
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int
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tar_rd(ARCHD *arcn, char *buf)
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{
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HD_TAR *hd;
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char *pt;
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/*
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* we only get proper sized buffers passed to us
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*/
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if (tar_id(buf, BLKMULT) < 0)
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return(-1);
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arcn->org_name = arcn->name;
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arcn->sb.st_nlink = 1;
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arcn->pat = NULL;
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/*
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* copy out the name and values in the stat buffer
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*/
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hd = (HD_TAR *)buf;
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/*
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* old tar format specifies the name always be null-terminated,
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* but let's be robust to broken archives.
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* the same applies to handling links below.
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*/
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arcn->nlen = l_strncpy(arcn->name, hd->name,
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MIN(sizeof(hd->name), sizeof(arcn->name)) - 1);
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arcn->name[arcn->nlen] = '\0';
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arcn->sb.st_mode = (mode_t)(asc_ul(hd->mode,sizeof(hd->mode),OCT) &
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0xfff);
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arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
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arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
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#ifdef NET2_STAT
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arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
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arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
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#else
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arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
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arcn->sb.st_mtime = (time_t)asc_uqd(hd->mtime, sizeof(hd->mtime), OCT);
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#endif
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arcn->sb.st_ctime = arcn->sb.st_atime = arcn->sb.st_mtime;
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/*
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* have to look at the last character, it may be a '/' and that is used
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* to encode this as a directory
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*/
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pt = &(arcn->name[arcn->nlen - 1]);
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arcn->pad = 0;
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arcn->skip = 0;
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switch(hd->linkflag) {
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case SYMTYPE:
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/*
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* symbolic link, need to get the link name and set the type in
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* the st_mode so -v printing will look correct.
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*/
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arcn->type = PAX_SLK;
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arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
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MIN(sizeof(hd->linkname), sizeof(arcn->ln_name)) - 1);
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arcn->ln_name[arcn->ln_nlen] = '\0';
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arcn->sb.st_mode |= S_IFLNK;
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break;
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case LNKTYPE:
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/*
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* hard link, need to get the link name, set the type in the
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* st_mode and st_nlink so -v printing will look better.
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*/
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arcn->type = PAX_HLK;
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arcn->sb.st_nlink = 2;
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arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
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MIN(sizeof(hd->linkname), sizeof(arcn->ln_name)) - 1);
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arcn->ln_name[arcn->ln_nlen] = '\0';
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/*
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* no idea of what type this thing really points at, but
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* we set something for printing only.
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*/
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arcn->sb.st_mode |= S_IFREG;
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break;
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case DIRTYPE:
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/*
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* It is a directory, set the mode for -v printing
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*/
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arcn->type = PAX_DIR;
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arcn->sb.st_mode |= S_IFDIR;
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arcn->sb.st_nlink = 2;
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arcn->ln_name[0] = '\0';
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arcn->ln_nlen = 0;
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break;
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case AREGTYPE:
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case REGTYPE:
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default:
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/*
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* If we have a trailing / this is a directory and NOT a file.
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*/
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arcn->ln_name[0] = '\0';
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arcn->ln_nlen = 0;
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if (*pt == '/') {
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/*
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* it is a directory, set the mode for -v printing
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*/
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arcn->type = PAX_DIR;
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arcn->sb.st_mode |= S_IFDIR;
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arcn->sb.st_nlink = 2;
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} else {
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/*
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* have a file that will be followed by data. Set the
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* skip value to the size field and calculate the size
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* of the padding.
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*/
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arcn->type = PAX_REG;
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arcn->sb.st_mode |= S_IFREG;
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arcn->pad = TAR_PAD(arcn->sb.st_size);
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arcn->skip = arcn->sb.st_size;
|
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}
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break;
|
|
}
|
|
|
|
/*
|
|
* strip off any trailing slash.
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|
*/
|
|
if (*pt == '/') {
|
|
*pt = '\0';
|
|
--arcn->nlen;
|
|
}
|
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return(0);
|
|
}
|
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|
|
/*
|
|
* 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
|
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* are too long. Be careful of the term (last arg) to ul_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
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tar_wr(ARCHD *arcn)
|
|
{
|
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HD_TAR *hd;
|
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int len;
|
|
HD_TAR hdblk;
|
|
|
|
/*
|
|
* 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:
|
|
paxwarn(1, "Tar cannot archive a character device %s",
|
|
arcn->org_name);
|
|
return(1);
|
|
case PAX_BLK:
|
|
paxwarn(1, "Tar cannot archive a block device %s", arcn->org_name);
|
|
return(1);
|
|
case PAX_SCK:
|
|
paxwarn(1, "Tar cannot archive a socket %s", arcn->org_name);
|
|
return(1);
|
|
case PAX_FIF:
|
|
paxwarn(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)) {
|
|
paxwarn(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)) {
|
|
paxwarn(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)
|
|
*/
|
|
hd = &hdblk;
|
|
l_strncpy(hd->name, arcn->name, sizeof(hd->name) - 1);
|
|
hd->name[sizeof(hd->name) - 1] = '\0';
|
|
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;
|
|
memset(hd->linkname, 0, sizeof(hd->linkname));
|
|
hd->name[len-1] = '/';
|
|
if (ul_oct((u_long)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;
|
|
l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
|
|
hd->linkname[sizeof(hd->linkname) - 1] = '\0';
|
|
if (ul_oct((u_long)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;
|
|
l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname) - 1);
|
|
hd->linkname[sizeof(hd->linkname) - 1] = '\0';
|
|
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 1))
|
|
goto out;
|
|
} else {
|
|
/*
|
|
* data follows this file, so set the pad
|
|
*/
|
|
hd->linkflag = AREGTYPE;
|
|
memset(hd->linkname, 0, sizeof(hd->linkname));
|
|
# ifdef NET2_STAT
|
|
if (ul_oct((u_long)arcn->sb.st_size, hd->size,
|
|
sizeof(hd->size), 1)) {
|
|
# else
|
|
if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
|
|
sizeof(hd->size), 1)) {
|
|
# endif
|
|
paxwarn(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 (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 0) ||
|
|
ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 0) ||
|
|
ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 0) ||
|
|
ul_oct((u_long)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 (ul_oct(tar_chksm((char *)&hdblk, sizeof(HD_TAR)), hd->chksum,
|
|
sizeof(hd->chksum), 3))
|
|
goto out;
|
|
if (wr_rdbuf((char *)&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
|
|
*/
|
|
paxwarn(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)
|
|
{
|
|
if ((usrtb_start() < 0) || (grptb_start() < 0))
|
|
return(-1);
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* ustar_stwr()
|
|
* initialization for ustar write
|
|
* Return:
|
|
* 0 if ok, -1 otherwise
|
|
*/
|
|
|
|
int
|
|
ustar_stwr(void)
|
|
{
|
|
if ((uidtb_start() < 0) || (gidtb_start() < 0))
|
|
return(-1);
|
|
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);
|
|
if (asc_ul(hd->chksum,sizeof(hd->chksum),OCT) != tar_chksm(blk,BLKMULT))
|
|
return(-1);
|
|
return(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 = 0;
|
|
dev_t devmajor;
|
|
dev_t devminor;
|
|
|
|
/*
|
|
* we only get proper sized buffers
|
|
*/
|
|
if (ustar_id(buf, BLKMULT) < 0)
|
|
return(-1);
|
|
arcn->org_name = arcn->name;
|
|
arcn->sb.st_nlink = 1;
|
|
arcn->pat = NULL;
|
|
arcn->nlen = 0;
|
|
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 = l_strncpy(dest, hd->prefix,
|
|
MIN(sizeof(hd->prefix), sizeof(arcn->name) - 2));
|
|
dest += cnt;
|
|
*dest++ = '/';
|
|
cnt++;
|
|
}
|
|
/*
|
|
* ustar format specifies the name may be unterminated
|
|
* if it fills the entire field. this also applies to
|
|
* the prefix and the linkname.
|
|
*/
|
|
arcn->nlen = cnt + l_strncpy(dest, hd->name,
|
|
MIN(sizeof(hd->name), sizeof(arcn->name) - cnt - 1));
|
|
arcn->name[arcn->nlen] = '\0';
|
|
|
|
/*
|
|
* 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_ul(hd->mode, sizeof(hd->mode), OCT) &
|
|
0xfff);
|
|
#ifdef NET2_STAT
|
|
arcn->sb.st_size = (off_t)asc_ul(hd->size, sizeof(hd->size), OCT);
|
|
arcn->sb.st_mtime = (time_t)asc_ul(hd->mtime, sizeof(hd->mtime), OCT);
|
|
#else
|
|
arcn->sb.st_size = (off_t)asc_uqd(hd->size, sizeof(hd->size), OCT);
|
|
arcn->sb.st_mtime = (time_t)asc_uqd(hd->mtime, sizeof(hd->mtime), OCT);
|
|
#endif
|
|
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_name(hd->gname, &(arcn->sb.st_gid)) < 0)
|
|
arcn->sb.st_gid = (gid_t)asc_ul(hd->gid, sizeof(hd->gid), OCT);
|
|
hd->uname[sizeof(hd->uname) - 1] = '\0';
|
|
if (uid_name(hd->uname, &(arcn->sb.st_uid)) < 0)
|
|
arcn->sb.st_uid = (uid_t)asc_ul(hd->uid, sizeof(hd->uid), OCT);
|
|
|
|
/*
|
|
* set the defaults, these may be changed depending on the file type
|
|
*/
|
|
arcn->ln_name[0] = '\0';
|
|
arcn->ln_nlen = 0;
|
|
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_ul(hd->devmajor,sizeof(hd->devmajor),OCT);
|
|
devminor = (dev_t)asc_ul(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;
|
|
}
|
|
/*
|
|
* copy the link name
|
|
*/
|
|
arcn->ln_nlen = l_strncpy(arcn->ln_name, hd->linkname,
|
|
MIN(sizeof(hd->linkname), sizeof(arcn->ln_name) - 1));
|
|
arcn->ln_name[arcn->ln_nlen] = '\0';
|
|
break;
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* 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 ul_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
|
|
*/
|
|
|
|
int
|
|
ustar_wr(ARCHD *arcn)
|
|
{
|
|
HD_USTAR *hd;
|
|
char *pt;
|
|
HD_USTAR hdblk;
|
|
|
|
/*
|
|
* check for those file system types ustar cannot store
|
|
*/
|
|
if (arcn->type == PAX_SCK) {
|
|
paxwarn(1, "Ustar cannot archive a socket %s", arcn->org_name);
|
|
return(1);
|
|
}
|
|
|
|
/*
|
|
* check the length of the linkname
|
|
*/
|
|
if (((arcn->type == PAX_SLK) || (arcn->type == PAX_HLK) ||
|
|
(arcn->type == PAX_HRG)) &&
|
|
(arcn->ln_nlen > (int)sizeof(hd->linkname))) {
|
|
paxwarn(1, "Link name too long for ustar %s", arcn->ln_name);
|
|
return(1);
|
|
}
|
|
|
|
/*
|
|
* 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) {
|
|
paxwarn(1, "File name too long for ustar %s", arcn->name);
|
|
return(1);
|
|
}
|
|
hd = &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';
|
|
l_strncpy(hd->prefix, arcn->name, sizeof(hd->prefix));
|
|
*pt++ = '/';
|
|
} else
|
|
memset(hd->prefix, 0, sizeof(hd->prefix));
|
|
|
|
/*
|
|
* copy the name part. this may be the whole path or the part after
|
|
* the prefix. both the name and prefix may fill the entire field.
|
|
*/
|
|
l_strncpy(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;
|
|
memset(hd->linkname, 0, sizeof(hd->linkname));
|
|
memset(hd->devmajor, 0, sizeof(hd->devmajor));
|
|
memset(hd->devminor, 0, sizeof(hd->devminor));
|
|
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
|
|
goto out;
|
|
break;
|
|
case PAX_CHR:
|
|
case PAX_BLK:
|
|
if (arcn->type == PAX_CHR)
|
|
hd->typeflag = CHRTYPE;
|
|
else
|
|
hd->typeflag = BLKTYPE;
|
|
memset(hd->linkname, 0, sizeof(hd->linkname));
|
|
if (ul_oct((u_long)MAJOR(arcn->sb.st_rdev), hd->devmajor,
|
|
sizeof(hd->devmajor), 3) ||
|
|
ul_oct((u_long)MINOR(arcn->sb.st_rdev), hd->devminor,
|
|
sizeof(hd->devminor), 3) ||
|
|
ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
|
|
goto out;
|
|
break;
|
|
case PAX_FIF:
|
|
hd->typeflag = FIFOTYPE;
|
|
memset(hd->linkname, 0, sizeof(hd->linkname));
|
|
memset(hd->devmajor, 0, sizeof(hd->devmajor));
|
|
memset(hd->devminor, 0, sizeof(hd->devminor));
|
|
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
|
|
goto out;
|
|
break;
|
|
case PAX_SLK:
|
|
case PAX_HLK:
|
|
case PAX_HRG:
|
|
if (arcn->type == PAX_SLK)
|
|
hd->typeflag = SYMTYPE;
|
|
else
|
|
hd->typeflag = LNKTYPE;
|
|
/* the link name may occupy the entire field in ustar */
|
|
l_strncpy(hd->linkname,arcn->ln_name, sizeof(hd->linkname));
|
|
memset(hd->devmajor, 0, sizeof(hd->devmajor));
|
|
memset(hd->devminor, 0, sizeof(hd->devminor));
|
|
if (ul_oct((u_long)0L, hd->size, sizeof(hd->size), 3))
|
|
goto out;
|
|
break;
|
|
case PAX_REG:
|
|
case PAX_CTG:
|
|
default:
|
|
/*
|
|
* file data with this type, set the padding
|
|
*/
|
|
if (arcn->type == PAX_CTG)
|
|
hd->typeflag = CONTTYPE;
|
|
else
|
|
hd->typeflag = REGTYPE;
|
|
memset(hd->linkname, 0, sizeof(hd->linkname));
|
|
memset(hd->devmajor, 0, sizeof(hd->devmajor));
|
|
memset(hd->devminor, 0, sizeof(hd->devminor));
|
|
arcn->pad = TAR_PAD(arcn->sb.st_size);
|
|
# ifdef NET2_STAT
|
|
if (ul_oct((u_long)arcn->sb.st_size, hd->size,
|
|
sizeof(hd->size), 3)) {
|
|
# else
|
|
if (uqd_oct((u_quad_t)arcn->sb.st_size, hd->size,
|
|
sizeof(hd->size), 3)) {
|
|
# endif
|
|
paxwarn(1,"File is too long for ustar %s",arcn->org_name);
|
|
return(1);
|
|
}
|
|
break;
|
|
}
|
|
|
|
l_strncpy(hd->magic, TMAGIC, TMAGLEN);
|
|
l_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 (ul_oct((u_long)arcn->sb.st_mode, hd->mode, sizeof(hd->mode), 3) ||
|
|
ul_oct((u_long)arcn->sb.st_uid, hd->uid, sizeof(hd->uid), 3) ||
|
|
ul_oct((u_long)arcn->sb.st_gid, hd->gid, sizeof(hd->gid), 3) ||
|
|
ul_oct((u_long)arcn->sb.st_mtime,hd->mtime,sizeof(hd->mtime),3))
|
|
goto out;
|
|
l_strncpy(hd->uname,name_uid(arcn->sb.st_uid, 0),sizeof(hd->uname));
|
|
l_strncpy(hd->gname,name_gid(arcn->sb.st_gid, 0),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 (ul_oct(tar_chksm((char *)&hdblk, sizeof(HD_USTAR)), hd->chksum,
|
|
sizeof(hd->chksum), 3))
|
|
goto out;
|
|
if (wr_rdbuf((char *)&hdblk, sizeof(HD_USTAR)) < 0)
|
|
return(-1);
|
|
if (wr_skip((off_t)(BLKMULT - sizeof(HD_USTAR))) < 0)
|
|
return(-1);
|
|
if ((arcn->type == PAX_CTG) || (arcn->type == PAX_REG))
|
|
return(0);
|
|
return(1);
|
|
|
|
out:
|
|
/*
|
|
* header field is out of range
|
|
*/
|
|
paxwarn(1, "Ustar header field is too small for %s", arcn->org_name);
|
|
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);
|
|
if (len > (TPFSZ + TNMSZ + 1))
|
|
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)
|
|
*/
|
|
start = name + len - TNMSZ - 1;
|
|
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 can not 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);
|
|
}
|