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pax.c

/*    $OpenBSD: pax.c,v 1.14 1998/09/20 02:22:22 millert Exp $    */
/*    $NetBSD: pax.c,v 1.5 1996/03/26 23:54:20 mrg 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1992, 1993\n\
      The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)pax.c   8.2 (Berkeley) 4/18/94";
#else
static char rcsid[] = "$OpenBSD: pax.c,v 1.14 1998/09/20 02:22:22 millert Exp $";
#endif
#endif /* not lint */

#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <signal.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include "pax.h"
#include "extern.h"
static int gen_init __P((void));

/*
 * PAX main routines, general globals and some simple start up routines
 */

/*
 * Variables that can be accessed by any routine within pax
 */
int   act = DEFOP;            /* read/write/append/copy */
FSUB  *frmt = NULL;           /* archive format type */
int   cflag;                  /* match all EXCEPT pattern/file */
int   cwdfd;                  /* starting cwd */
int   dflag;                  /* directory member match only  */
int   iflag;                  /* interactive file/archive rename */
int   kflag;                  /* do not overwrite existing files */
int   lflag;                  /* use hard links when possible */
int   nflag;                  /* select first archive member match */
int   tflag;                  /* restore access time after read */
int   uflag;                  /* ignore older modification time files */
int   vflag;                  /* produce verbose output */
int   zflag;                  /* use gzip */
int   Dflag;                  /* same as uflag except inode change time */
int   Hflag;                  /* follow command line symlinks (write only) */
int   Lflag;                  /* follow symlinks when writing */
int   Xflag;                  /* archive files with same device id only */
int   Yflag;                  /* same as Dflg except after name mode */
int   Zflag;                  /* same as uflg except after name mode */
int   vfpart;                 /* is partial verbose output in progress */
int   patime = 1;       /* preserve file access time */
int   pmtime = 1;       /* preserve file modification times */
int   nodirs;                 /* do not create directories as needed */
int   pmode;                  /* preserve file mode bits */
int   pids;             /* preserve file uid/gid */
int   rmleadslash = 0;  /* remove leading '/' from pathnames */
int   exit_val;         /* exit value */
int   docrc;                  /* check/create file crc */
char  *dirptr;          /* destination dir in a copy */
char  *ltmfrmt;         /* -v locale time format (if any) */
char  *argv0;                 /* root of argv[0] */
sigset_t s_mask;        /* signal mask for cleanup critical sect */
FILE  *listf = stderr;  /* file pointer to print file list to */

/*
 *    PAX - Portable Archive Interchange
 *
 *    A utility to read, write, and write lists of the members of archive
 *    files and copy directory hierarchies. A variety of archive formats
 *    are supported (some are described in POSIX 1003.1 10.1):
 *
 *          ustar - 10.1.1 extended tar interchange format
 *          cpio  - 10.1.2 extended cpio interchange format
 *          tar - old BSD 4.3 tar format
 *          binary cpio - old cpio with binary header format
 *          sysVR4 cpio -  with and without CRC
 *
 * This version is a superset of IEEE Std 1003.2b-d3
 *
 * Summary of Extensions to the IEEE Standard:
 *
 * 1  READ ENHANCEMENTS
 * 1.1      Operations which read archives will continue to operate even when
 *    processing archives which may be damaged, truncated, or fail to meet 
 *    format specs in several different ways. Damaged sections of archives
 *    are detected and avoided if possible. Attempts will be made to resync
 *    archive read operations even with badly damaged media.
 * 1.2      Blocksize requirements are not strictly enforced on archive read.
 *    Tapes which have variable sized records can be read without errors.
 * 1.3      The user can specify via the non-standard option flag -E if error
 *    resync operation should stop on a media error, try a specified number
 *    of times to correct, or try to correct forever.
 * 1.4      Sparse files (lseek holes) stored on the archive (but stored with blocks
 *    of all zeros will be restored with holes appropriate for the target
 *    filesystem
 * 1.5      The user is notified whenever something is found during archive
 *    read operations which violates spec (but the read will continue).
 * 1.6      Multiple archive volumes can be read and may span over different
 *    archive devices 
 * 1.7      Rigidly restores all file attributes exactly as they are stored on the
 *    archive.
 * 1.8      Modification change time ranges can be specified via multiple -T
 *    options. These allow a user to select files whose modification time
 *    lies within a specific time range.
 * 1.9      Files can be selected based on owner (user name or uid) via one or more
 *    -U options.
 * 1.10     Files can be selected based on group (group name or gid) via one o
 *    more -G options.
 * 1.11     File modification time can be checked against exisiting file after
 *    name modification (-Z)
 *
 * 2  WRITE ENHANCEMENTS
 * 2.1      Write operation will stop instead of allowing a user to create a flawed
 *    flawed archive (due to any problem).
 * 2.2      Archives writtens by pax are forced to strictly conform to both the
 *    archive and pax the spceific format specifications.
 * 2.3      Blocking size and format is rigidly enforced on writes.
 * 2.4      Formats which may exhibit header overflow problems (they have fields
 *    too small for large file systems, such as inode number storage), use
 *    routines designed to repair this problem. These techniques still
 *    conform to both pax and format specifications, but no longer truncate
 *    these fields. This removes any restrictions on using these archive
 *    formats on large file systems.
 * 2.5      Multiple archive volumes can be written and may span over different
 *    archive devices 
 * 2.6      A archive volume record limit allows the user to specify the number
 *    of bytes stored on an archive volume. When reached the user is
 *    prompted for the next archive volume. This is specified with the
 *    non-standard -B flag. THe limit is rounded up to the next blocksize.
 * 2.7      All archive padding during write use zero filled sections. This makes
 *    it much easier to pull data out of flawed archive during read
 *    operations.
 * 2.8      Access time reset with the -t applies to all file nodes (including
 *    directories).
 * 2.9      Symbolic links can be followed with -L (optional in the spec).
 * 2.10     Modification or inode change time ranges can be specified via
 *    multiple -T options. These allow a user to select files whose
 *    modification or inode change time lies within a specific time range.
 * 2.11     Files can be selected based on owner (user name or uid) via one or more
 *    -U options.
 * 2.12     Files can be selected based on group (group name or gid) via one o
 *    more -G options.
 * 2.13     Symlinks which appear on the command line can be followed (without
 *    following other symlinks; -H flag)
 *
 * 3  COPY ENHANCEMENTS
 * 3.1      Sparse files (lseek holes) can be copied without expanding the holes
 *    into zero filled blocks. The file copy is created with holes which are
 *    appropriate for the target filesystem
 * 3.2      Access time as well as modification time on copied file trees can be
 *    preserved with the appropriate -p options.
 * 3.3      Access time reset with the -t applies to all file nodes (including
 *    directories).
 * 3.4      Symbolic links can be followed with -L (optional in the spec).
 * 3.5      Modification or inode change time ranges can be specified via
 *    multiple -T options. These allow a user to select files whose
 *    modification or inode change time lies within a specific time range.
 * 3.6      Files can be selected based on owner (user name or uid) via one or more
 *    -U options.
 * 3.7      Files can be selected based on group (group name or gid) via one o
 *    more -G options.
 * 3.8      Symlinks which appear on the command line can be followed (without
 *    following other symlinks; -H flag)
 * 3.9  File inode change time can be checked against exisiting file before
 *    name modification (-D)
 * 3.10 File inode change time can be checked against exisiting file after
 *    name modification (-Y)
 * 3.11     File modification time can be checked against exisiting file after
 *    name modification (-Z)
 *
 * 4  GENERAL ENHANCEMENTS
 * 4.1      Internal structure is designed to isolate format dependent and 
 *    independent functions. Formats are selected via a format driver table.
 *    This encourages the addition of new archive formats by only having to
 *    write those routines which id, read and write the archive header.
 */

/*
 * main()
 *    parse options, set up and operate as specified by the user.
 *    any operational flaw will set exit_val to non-zero
 * Return: 0 if ok, 1 otherwise
 */

#ifdef __STDC__
int
main(int argc, char **argv)
#else
int
main(argc, argv)
      int argc;
      char **argv;
#endif
{
      /*
       * Keep a reference to cwd, so we can always come back home.
       */
      cwdfd = open(".", O_RDONLY);
      if (cwdfd < 0) {
            syswarn(0, errno, "Can't open current working directory.");
            return(exit_val);
      }

      /*
       * parse options, determine operational mode, general init
       */
      options(argc, argv);
      if ((gen_init() < 0) || (tty_init() < 0))
            return(exit_val);

      /*
       * select a primary operation mode 
       */
      switch(act) {
      case EXTRACT:
            extract();
            break;
      case ARCHIVE:
            archive();
            break;
      case APPND:
            append();
            break;
      case COPY:
            copy();
            break;
      default:
      case LIST:
            list();
            break;
      }
      return(exit_val);
}

/*
 * sig_cleanup()
 *    when interrupted we try to do whatever delayed processing we can.
 *    This is not critical, but we really ought to limit our damage when we
 *    are aborted by the user.
 * Return:
 *    never....
 */

#ifdef __STDC__
void
sig_cleanup(int which_sig)
#else
void
sig_cleanup(which_sig)
      int which_sig;
#endif
{
      /*
       * restore modes and times for any dirs we may have created
       * or any dirs we may have read. Set vflag and vfpart so the user
       * will clearly see the message on a line by itself.
       */
      vflag = vfpart = 1;
      if (which_sig == SIGXCPU)
            paxwarn(0, "Cpu time limit reached, cleaning up.");
      else
            paxwarn(0, "Signal caught, cleaning up.");

      ar_close();
      proc_dir();
      if (tflag)
            atdir_end();
      exit(1);
}

/*
 * gen_init()
 *    general setup routines. Not all are required, but they really help
 *    when dealing with a medium to large sized archives.
 */

#ifdef __STDC__
static int
gen_init(void)
#else
static int
gen_init()
#endif
{
      struct rlimit reslimit;
      struct sigaction n_hand;
      struct sigaction o_hand;

      /*
       * Really needed to handle large archives. We can run out of memory for
       * internal tables really fast when we have a whole lot of files...
       */
      if (getrlimit(RLIMIT_DATA , &reslimit) == 0){
            reslimit.rlim_cur = reslimit.rlim_max;
            (void)setrlimit(RLIMIT_DATA , &reslimit);
      }

      /*
       * should file size limits be waived? if the os limits us, this is
       * needed if we want to write a large archive
       */
      if (getrlimit(RLIMIT_FSIZE , &reslimit) == 0){
            reslimit.rlim_cur = reslimit.rlim_max;
            (void)setrlimit(RLIMIT_FSIZE , &reslimit);
      }

      /*
       * increase the size the stack can grow to
       */
      if (getrlimit(RLIMIT_STACK , &reslimit) == 0){
            reslimit.rlim_cur = reslimit.rlim_max;
            (void)setrlimit(RLIMIT_STACK , &reslimit);
      }

      /*
       * not really needed, but doesn't hurt
       */
      if (getrlimit(RLIMIT_RSS , &reslimit) == 0){
            reslimit.rlim_cur = reslimit.rlim_max;
            (void)setrlimit(RLIMIT_RSS , &reslimit);
      }

      /*
       * Handle posix locale
       *
       * set user defines time printing format for -v option 
       */
      ltmfrmt = getenv("LC_TIME");

      /*
       * signal handling to reset stored directory times and modes. Since
       * we deal with broken pipes via failed writes we ignore it. We also
       * deal with any file size limit thorugh failed writes. Cpu time
       * limits are caught and a cleanup is forced.
       */
      if ((sigemptyset(&s_mask) < 0) || (sigaddset(&s_mask, SIGTERM) < 0) ||
          (sigaddset(&s_mask,SIGINT) < 0)||(sigaddset(&s_mask,SIGHUP) < 0) ||
          (sigaddset(&s_mask,SIGPIPE) < 0)||(sigaddset(&s_mask,SIGQUIT)<0) ||
          (sigaddset(&s_mask,SIGXCPU) < 0)||(sigaddset(&s_mask,SIGXFSZ)<0)) {
            paxwarn(1, "Unable to set up signal mask");
            return(-1);
      }
      memset(&n_hand, 0, sizeof n_hand);
      n_hand.sa_mask = s_mask;
      n_hand.sa_flags = 0;
      n_hand.sa_handler = sig_cleanup;

      if ((sigaction(SIGHUP, &n_hand, &o_hand) < 0) &&
          (o_hand.sa_handler == SIG_IGN) &&
          (sigaction(SIGHUP, &o_hand, &o_hand) < 0))
            goto out;

      if ((sigaction(SIGTERM, &n_hand, &o_hand) < 0) &&
          (o_hand.sa_handler == SIG_IGN) &&
          (sigaction(SIGTERM, &o_hand, &o_hand) < 0))
            goto out;

      if ((sigaction(SIGINT, &n_hand, &o_hand) < 0) &&
          (o_hand.sa_handler == SIG_IGN) &&
          (sigaction(SIGINT, &o_hand, &o_hand) < 0))
            goto out;

      if ((sigaction(SIGQUIT, &n_hand, &o_hand) < 0) &&
          (o_hand.sa_handler == SIG_IGN) &&
          (sigaction(SIGQUIT, &o_hand, &o_hand) < 0))
            goto out;

      if ((sigaction(SIGXCPU, &n_hand, &o_hand) < 0) &&
          (o_hand.sa_handler == SIG_IGN) &&
          (sigaction(SIGXCPU, &o_hand, &o_hand) < 0))
            goto out;

      n_hand.sa_handler = SIG_IGN;
      if ((sigaction(SIGPIPE, &n_hand, &o_hand) < 0) ||
          (sigaction(SIGXFSZ, &n_hand, &o_hand) < 0))
            goto out;
      return(0);

    out:
      syswarn(1, errno, "Unable to set up signal handler");
      return(-1);
}

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