408 lines
14 KiB
C
408 lines
14 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* $Id$
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1992, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)pax.c 8.2 (Berkeley) 4/18/94";
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#endif /* not lint */
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#include <stdio.h>
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#include <sys/types.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <signal.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "pax.h"
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#include "extern.h"
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static int gen_init __P((void));
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/*
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* PAX main routines, general globals and some simple start up routines
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*/
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/*
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* Variables that can be accessed by any routine within pax
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*/
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int act = DEFOP; /* read/write/append/copy */
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FSUB *frmt = NULL; /* archive format type */
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int cflag; /* match all EXCEPT pattern/file */
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int dflag; /* directory member match only */
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int iflag; /* interactive file/archive rename */
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int kflag; /* do not overwrite existing files */
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int lflag; /* use hard links when possible */
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int nflag; /* select first archive member match */
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int tflag; /* restore access time after read */
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int uflag; /* ignore older modification time files */
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int vflag; /* produce verbose output */
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int Dflag; /* same as uflag except inode change time */
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int Hflag; /* follow command line symlinks (write only) */
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int Lflag; /* follow symlinks when writing */
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int Xflag; /* archive files with same device id only */
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int Yflag; /* same as Dflg except after name mode */
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int Zflag; /* same as uflg except after name mode */
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int vfpart; /* is partial verbose output in progress */
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int patime = 1; /* preserve file access time */
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int pmtime = 1; /* preserve file modification times */
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int pmode; /* preserve file mode bits */
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int pids; /* preserve file uid/gid */
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int exit_val; /* exit value */
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int docrc; /* check/create file crc */
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char *dirptr; /* destination dir in a copy */
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char *ltmfrmt; /* -v locale time format (if any) */
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char *argv0; /* root of argv[0] */
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sigset_t s_mask; /* signal mask for cleanup critical sect */
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/*
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* PAX - Portable Archive Interchange
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*
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* A utility to read, write, and write lists of the members of archive
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* files and copy directory hierarchies. A variety of archive formats
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* are supported (some are described in POSIX 1003.1 10.1):
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*
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* ustar - 10.1.1 extended tar interchange format
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* cpio - 10.1.2 extended cpio interchange format
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* tar - old BSD 4.3 tar format
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* binary cpio - old cpio with binary header format
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* sysVR4 cpio - with and without CRC
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*
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* This version is a superset of IEEE Std 1003.2b-d3
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*
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* Summary of Extensions to the IEEE Standard:
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*
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* 1 READ ENHANCEMENTS
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* 1.1 Operations which read archives will continue to operate even when
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* processing archives which may be damaged, truncated, or fail to meet
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* format specs in several different ways. Damaged sections of archives
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* are detected and avoided if possible. Attempts will be made to resync
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* archive read operations even with badly damaged media.
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* 1.2 Blocksize requirements are not strictly enforced on archive read.
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* Tapes which have variable sized records can be read without errors.
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* 1.3 The user can specify via the non-standard option flag -E if error
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* resync operation should stop on a media error, try a specified number
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* of times to correct, or try to correct forever.
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* 1.4 Sparse files (lseek holes) stored on the archive (but stored with blocks
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* of all zeros will be restored with holes appropriate for the target
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* filesystem
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* 1.5 The user is notified whenever something is found during archive
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* read operations which violates spec (but the read will continue).
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* 1.6 Multiple archive volumes can be read and may span over different
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* archive devices
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* 1.7 Rigidly restores all file attributes exactly as they are stored on the
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* archive.
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* 1.8 Modification change time ranges can be specified via multiple -T
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* options. These allow a user to select files whose modification time
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* lies within a specific time range.
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* 1.9 Files can be selected based on owner (user name or uid) via one or more
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* -U options.
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* 1.10 Files can be selected based on group (group name or gid) via one o
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* more -G options.
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* 1.11 File modification time can be checked against exisiting file after
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* name modification (-Z)
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*
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* 2 WRITE ENHANCEMENTS
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* 2.1 Write operation will stop instead of allowing a user to create a flawed
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* flawed archive (due to any problem).
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* 2.2 Archives writtens by pax are forced to strictly conform to both the
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* archive and pax the spceific format specifications.
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* 2.3 Blocking size and format is rigidly enforced on writes.
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* 2.4 Formats which may exhibit header overflow problems (they have fields
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* too small for large file systems, such as inode number storage), use
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* routines designed to repair this problem. These techniques still
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* conform to both pax and format specifications, but no longer truncate
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* these fields. This removes any restrictions on using these archive
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* formats on large file systems.
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* 2.5 Multiple archive volumes can be written and may span over different
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* archive devices
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* 2.6 A archive volume record limit allows the user to specify the number
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* of bytes stored on an archive volume. When reached the user is
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* prompted for the next archive volume. This is specified with the
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* non-standard -B flag. THe limit is rounded up to the next blocksize.
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* 2.7 All archive padding during write use zero filled sections. This makes
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* it much easier to pull data out of flawed archive during read
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* operations.
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* 2.8 Access time reset with the -t applies to all file nodes (including
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* directories).
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* 2.9 Symbolic links can be followed with -L (optional in the spec).
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* 2.10 Modification or inode change time ranges can be specified via
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* multiple -T options. These allow a user to select files whose
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* modification or inode change time lies within a specific time range.
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* 2.11 Files can be selected based on owner (user name or uid) via one or more
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* -U options.
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* 2.12 Files can be selected based on group (group name or gid) via one o
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* more -G options.
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* 2.13 Symlinks which appear on the command line can be followed (without
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* following other symlinks; -H flag)
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*
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* 3 COPY ENHANCEMENTS
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* 3.1 Sparse files (lseek holes) can be copied without expanding the holes
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* into zero filled blocks. The file copy is created with holes which are
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* appropriate for the target filesystem
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* 3.2 Access time as well as modification time on copied file trees can be
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* preserved with the appropriate -p options.
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* 3.3 Access time reset with the -t applies to all file nodes (including
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* directories).
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* 3.4 Symbolic links can be followed with -L (optional in the spec).
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* 3.5 Modification or inode change time ranges can be specified via
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* multiple -T options. These allow a user to select files whose
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* modification or inode change time lies within a specific time range.
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* 3.6 Files can be selected based on owner (user name or uid) via one or more
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* -U options.
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* 3.7 Files can be selected based on group (group name or gid) via one o
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* more -G options.
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* 3.8 Symlinks which appear on the command line can be followed (without
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* following other symlinks; -H flag)
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* 3.9 File inode change time can be checked against exisiting file before
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* name modification (-D)
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* 3.10 File inode change time can be checked against exisiting file after
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* name modification (-Y)
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* 3.11 File modification time can be checked against exisiting file after
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* name modification (-Z)
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*
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* 4 GENERAL ENHANCEMENTS
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* 4.1 Internal structure is designed to isolate format dependent and
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* independent functions. Formats are selected via a format driver table.
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* This encourages the addition of new archive formats by only having to
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* write those routines which id, read and write the archive header.
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*/
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/*
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* main()
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* parse options, set up and operate as specified by the user.
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* any operational flaw will set exit_val to non-zero
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* Return: 0 if ok, 1 otherwise
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*/
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#if __STDC__
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int
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main(int argc, char **argv)
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#else
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int
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main(argc, argv)
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int argc;
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char **argv;
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#endif
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{
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/*
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* parse options, determine operational mode, general init
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*/
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options(argc, argv);
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if ((gen_init() < 0) || (tty_init() < 0))
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return(exit_val);
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/*
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* select a primary operation mode
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*/
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switch(act) {
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case EXTRACT:
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extract();
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break;
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case ARCHIVE:
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archive();
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break;
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case APPND:
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append();
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break;
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case COPY:
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copy();
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break;
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default:
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case LIST:
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list();
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break;
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}
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return(exit_val);
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}
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/*
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* sig_cleanup()
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* when interrupted we try to do whatever delayed processing we can.
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* This is not critical, but we really ought to limit our damage when we
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* are aborted by the user.
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* Return:
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* never....
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*/
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#if __STDC__
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void
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sig_cleanup(int which_sig)
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#else
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void
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sig_cleanup(which_sig)
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int which_sig;
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#endif
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{
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/*
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* restore modes and times for any dirs we may have created
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* or any dirs we may have read. Set vflag and vfpart so the user
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* will clearly see the message on a line by itself.
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*/
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vflag = vfpart = 1;
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if (which_sig == SIGXCPU)
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warn(0, "Cpu time limit reached, cleaning up.");
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else
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warn(0, "Signal caught, cleaning up.");
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ar_close();
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proc_dir();
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if (tflag)
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atdir_end();
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exit(1);
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}
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/*
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* gen_init()
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* general setup routines. Not all are required, but they really help
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* when dealing with a medium to large sized archives.
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*/
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#if __STDC__
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static int
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gen_init(void)
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#else
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static int
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gen_init()
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#endif
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{
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struct rlimit reslimit;
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struct sigaction n_hand;
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struct sigaction o_hand;
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/*
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* Really needed to handle large archives. We can run out of memory for
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* internal tables really fast when we have a whole lot of files...
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*/
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if (getrlimit(RLIMIT_DATA , &reslimit) == 0){
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reslimit.rlim_cur = reslimit.rlim_max;
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(void)setrlimit(RLIMIT_DATA , &reslimit);
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}
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/*
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* should file size limits be waived? if the os limits us, this is
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* needed if we want to write a large archive
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*/
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if (getrlimit(RLIMIT_FSIZE , &reslimit) == 0){
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reslimit.rlim_cur = reslimit.rlim_max;
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(void)setrlimit(RLIMIT_FSIZE , &reslimit);
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}
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/*
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* increase the size the stack can grow to
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*/
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if (getrlimit(RLIMIT_STACK , &reslimit) == 0){
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reslimit.rlim_cur = reslimit.rlim_max;
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(void)setrlimit(RLIMIT_STACK , &reslimit);
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}
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/*
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* not really needed, but doesn't hurt
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*/
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if (getrlimit(RLIMIT_RSS , &reslimit) == 0){
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reslimit.rlim_cur = reslimit.rlim_max;
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(void)setrlimit(RLIMIT_RSS , &reslimit);
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}
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/*
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* Handle posix locale
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*
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* set user defines time printing format for -v option
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*/
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ltmfrmt = getenv("LC_TIME");
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/*
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* signal handling to reset stored directory times and modes. Since
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* we deal with broken pipes via failed writes we ignore it. We also
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* deal with any file size limit thorugh failed writes. Cpu time
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* limits are caught and a cleanup is forced.
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*/
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if ((sigemptyset(&s_mask) < 0) || (sigaddset(&s_mask, SIGTERM) < 0) ||
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(sigaddset(&s_mask,SIGINT) < 0)||(sigaddset(&s_mask,SIGHUP) < 0) ||
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(sigaddset(&s_mask,SIGPIPE) < 0)||(sigaddset(&s_mask,SIGQUIT)<0) ||
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(sigaddset(&s_mask,SIGXCPU) < 0)||(sigaddset(&s_mask,SIGXFSZ)<0)) {
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warn(1, "Unable to set up signal mask");
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return(-1);
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}
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n_hand.sa_mask = s_mask;
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n_hand.sa_flags = 0;
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n_hand.sa_handler = sig_cleanup;
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if ((sigaction(SIGHUP, &n_hand, &o_hand) < 0) &&
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(o_hand.sa_handler == SIG_IGN) &&
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(sigaction(SIGHUP, &o_hand, &o_hand) < 0))
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goto out;
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if ((sigaction(SIGTERM, &n_hand, &o_hand) < 0) &&
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(o_hand.sa_handler == SIG_IGN) &&
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(sigaction(SIGTERM, &o_hand, &o_hand) < 0))
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goto out;
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if ((sigaction(SIGINT, &n_hand, &o_hand) < 0) &&
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(o_hand.sa_handler == SIG_IGN) &&
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(sigaction(SIGINT, &o_hand, &o_hand) < 0))
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goto out;
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if ((sigaction(SIGQUIT, &n_hand, &o_hand) < 0) &&
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(o_hand.sa_handler == SIG_IGN) &&
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(sigaction(SIGQUIT, &o_hand, &o_hand) < 0))
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goto out;
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if ((sigaction(SIGXCPU, &n_hand, &o_hand) < 0) &&
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(o_hand.sa_handler == SIG_IGN) &&
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(sigaction(SIGXCPU, &o_hand, &o_hand) < 0))
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goto out;
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n_hand.sa_handler = SIG_IGN;
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if ((sigaction(SIGPIPE, &n_hand, &o_hand) < 0) ||
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(sigaction(SIGXFSZ, &n_hand, &o_hand) < 0))
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goto out;
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return(0);
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out:
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syswarn(1, errno, "Unable to set up signal handler");
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return(-1);
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}
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