NetNews Usenet Archive 1992 #16/NN_1992_16.iso/spool/comp/sources/3b1/81

Internet Message Format | 1992-07-21 | 18.7 KB

Path: sparky!uunet!comp-sources-3b1
From: [e-mail] (David H. Brierley)
Newsgroups: comp.sources.3b1
Subject: v02i028:  Trim wtmp file to a manageable size, Part01/01
Date: 21 Jul 1992 22:28:40 -0400
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Submitted-by: [e-mail] (David H. Brierley)
Posting-number: Volume 2, Issue 28
Archive-name: wtrim/part01

This is the README file for the Dave Brierley collection of miscellaneous
source programs.  The collection is posted in seven separate pieces but
all of the source came from the "misc" directory on my machine.  As a result
of this, there is only one README file and only one Makefile, although each
of the seven postings will contain a copy of these two files.  I suggest
that you obtain (or save) as many of these postings as you are interested
in, unpack them all in a single directory, and then compile the sources.
Note that some of the programs are actually shell scripts and therefore do
not need compilation.

wclipper.c
 A program to read in the wtmp file and output the tail end of it.  Useful
 if you want to maintain an N-day history of who has been using your system.
 The output size can be specified in terms of days or kbytes.

wtmp.fix.sh
 A shell script to control the operation of wclipper.

#! /bin/sh
# This is a shell archive.  Remove anything before this line, then unpack
# it by saving it into a file and typing "sh file".  To overwrite existing
# files, type "sh file -c".  You can also feed this as standard input via
# unshar, or by typing "sh <file", e.g..  If this archive is complete, you
# will see the following message at the end:
#        "End of archive 1 (of 1)."
# Contents:  MANIFEST Makefile README wclipper.c wtmp.fix.sh
# Wrapped by dave@galaxia on Tue Jul 21 10:48:15 1992
PATH=/bin:/usr/bin:/usr/ucb ; export PATH
if test -f 'MANIFEST' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'MANIFEST'\"
else
echo shar: Extracting \"'MANIFEST'\" \(251 characters\)
sed "s/^X//" >'MANIFEST' <<'END_OF_FILE'
X   File Name        Archive #    Description
X-----------------------------------------------------------
X MANIFEST                   1
X Makefile                   1
X README                     1
X wclipper.c                 1
X wtmp.fix.sh                1
END_OF_FILE
if test 251 -ne `wc -c <'MANIFEST'`; then
    echo shar: \"'MANIFEST'\" unpacked with wrong size!
fi
# end of 'MANIFEST'
fi
if test -f 'Makefile' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'Makefile'\"
else
echo shar: Extracting \"'Makefile'\" \(374 characters\)
sed "s/^X//" >'Makefile' <<'END_OF_FILE'
XCFLAGS    = -O
X
Xall:        bsdln disktest email ndf techo wclipper
X
Xbsdln:        bsdln.o
X        $(CC) bsdln.o
X        mv a.out bsdln
X
Xdisktest:    disktest.o
X        $(CC) disktest.o
X        mv a.out disktest
X
Xemail:        email.o
X        $(CC) email.o
X        mv a.out email
X
Xndf:        ndf.o
X        $(CC) ndf.o
X        mv a.out ndf
X
Xtecho:        techo.o
X        $(CC) techo.o
X        mv a.out techo
X
Xwclipper:    wclipper.o
X        $(CC) wclipper.o
X        mv a.out wclipper
X
END_OF_FILE
if test 374 -ne `wc -c <'Makefile'`; then
    echo shar: \"'Makefile'\" unpacked with wrong size!
fi
# end of 'Makefile'
fi
if test -f 'README' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'README'\"
else
echo shar: Extracting \"'README'\" \(4280 characters\)
sed "s/^X//" >'README' <<'END_OF_FILE'
XThis is the README file for the Dave Brierley collection of miscellaneous
Xsource programs.  The collection is posted in seven separate pieces but
Xall of the source came from the "misc" directory on my machine.  As a result
Xof this, there is only one README file and only one Makefile, although each
Xof the seven postings will contain a copy of these two files.  I suggest
Xthat you obtain (or save) as many of these postings as you are interested
Xin, unpack them all in a single directory, and then compile the sources.
XNote that some of the programs are actually shell scripts and therefore do
Xnot need compilation.
X
XINSTALLATION INSTRUCTIONS:
X1. Compile all the source programs by typing "make all".  Edit the Makefile
X   if you did not unpack all seven of the pieces.  Note that the Makefile
X   does not contain explicit commands for using the shared library.  I always
X   depend on "ccc" to do this for me.
X2. Copy the resultant executables to your favorite bin directory.  I always
X   use "/usr/local/bin".
X3. Copy the various shell scripts to the bin directory and make then executable
X   using the chmod command.  The shell scripts are all distributed with a
X   suffix of ".sh".  I suggest you remove this suffix when you install it, but
X   that is entirely up to you.
X
X
XDescription of programs included in this package.  There is a line of dashes
Xseparating each of the seven pieces.
X
Xbsdln.c
X A version of the ln command that follows the BSD behaviour.  I.e. if the
X target file exists, the command will fail.  The standard 3b1 version will
X remove the target.
X
X--------------------------------------------------------------------------
X
Xinstall.sh
X A shell script version of the BSD install command.
X
Xnull.sh
X Zero out one or more files.
X
Xtolower.sh
X Convert file names to lower case.  Requires ksh.
X
Xtoupper.sh
X Convert file names to upper case.  Requires ksh.
X
X--------------------------------------------------------------------------
X
Xndf.c
X Almost emulates the BSD df command.  I say "almost" because I chose to
X display the numbers in terms of blocks instead of kbytes since everything
X else on the machine displays sizes in blocks.  Supports the "-i" option
X to displays inode information.  Also supports specifying any random
X directory as an argument and it will figure out what file system it is.
X
X--------------------------------------------------------------------------
X
Xdisktest.c
X A program used by the format script to test the floppy disk to be doubly
X sure that it is usable.
X
Xformat.sh
X Format a floppy disk.  Asks questions to determine desired parameters, such
X as number of cylinders and number of sectors.  Will optionally run an
X intensive surface test of the floppy (see disktest.c), build a file system
X structure, and make the floppy bootable.  The main processing is done in a
X loop so you can format multiple floppies easily.
X
Xnewfs.sh
X Reads the VHB from the floppy and then builds a file system structure on it.
X
X--------------------------------------------------------------------------
X
Xtecho.c
X A version of echo that allows direct access to termcap capabilities.  A lot
X easier to use than intermixing calls to echo with calls to tput.
X
Xtecho.1
X Hey, I actually wrote a man page for this one!
X
X--------------------------------------------------------------------------
X
Xwclipper.c
X A program to read in the wtmp file and output the tail end of it.  Useful
X if you want to maintain an N-day history of who has been using your system.
X The output size can be specified in terms of days or kbytes.
X
Xwtmp.fix.sh
X A shell script to control the operation of wclipper.
X
X--------------------------------------------------------------------------
X
Xemail.c
X A version of the "email" program.  This program should be installed as
X /usr/bin/email and it will be used by pcmgr (or by smgr) when you click
X on the envelope icon.  It provides a safe interface to the mail program
X by making sure the uid is set correctly and by doing a chdir to the
X users home directory (both of which are already being done by pcmgr).
X This version also provides a unique feature of reading an "rc" file
X from the users home directory (~/.email.rc), which can be used to specify
X what mail program to use.  See the sample provided.
X
Xemail.rc
X Sample .email.rc file.
END_OF_FILE
if test 4280 -ne `wc -c <'README'`; then
    echo shar: \"'README'\" unpacked with wrong size!
fi
# end of 'README'
fi
if test -f 'wclipper.c' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'wclipper.c'\"
else
echo shar: Extracting \"'wclipper.c'\" \(8993 characters\)
sed "s/^X//" >'wclipper.c' <<'END_OF_FILE'
X/*--------------------------------------------------------------
X*
X* Program: wclipper
X*
X* This program is used to sanely trim the wtmp file by removing
X* entries from the beginning.  Options allow for trimming the
X* file based on the time stamps in the entries or simply keeping
X* the last N blocks of the file.
X*
X* David H. Brierley
X* Raytheon Submarine Signal Division
X* Portsmouth, RI 02871
X*
X*--------------------------------------------------------------*/
X
X#include <stdio.h>
X#include <sys/types.h>
X#include <sys/stat.h>
X#include <utmp.h>
X#ifdef    BSD
X# include <strings.h>
X# include <sys/time.h>
X#else
X# include <string.h>
X# include <time.h>
X#endif
X
X#define    UBLOCK        4096
X#define UBUFSIZ        UBLOCK * sizeof (struct utmp)
X#define WTMPFILE    "/usr/adm/wtmp"
X
Xstruct utmp    *utmp;
Xstruct utmp     ubuffer[UBLOCK];
X
X#ifndef lint
Xextern char    *optarg;
X#else
Xstatic char    *optarg;
X#endif
X
Xextern char    *malloc ();
Xextern long     lseek ();
Xextern time_t   time ();
Xextern void     exit ();
Xextern void     perror ();
X
Xmain (argc, argv)
Xint             argc;
Xchar           *argv[];
X{
X    int             optch;
X    int             skip_size;
X    int             verbose;
X    time_t          now;
X    time_t          clip_time;
X    long            clip_size;
X    char           *infile;
X    char           *outfile;
X
X    skip_size = 10240;
X    (void) time (&now);
X    clip_time = 0;
X    clip_size = 0;
X    verbose = 0;
X    infile = WTMPFILE;
X    outfile = NULL;
X
X    /*
X     * Scan the argument list
X     */
X    while ((optch = getopt (argc, argv, "i:o:d:h:k:s:v")) != EOF) {
X    switch (optch) {
X    case 'd':        /* trim at this many days */
X        clip_time = atoi (optarg) * 24;
X        break;
X    case 'h':        /* trim at this many hours */
X        clip_time = atoi (optarg);
X        break;
X    case 'k':        /* keep this many Kbytes of data */
X        clip_size = atoi (optarg);
X        break;
X    case 's':        /* number of entries to skip while scanning */
X        skip_size = atoi (optarg);
X        break;
X    case 'i':        /* name of input file */
X        infile = malloc ((unsigned) strlen (optarg) + 1);
X        (void) strcpy (infile, optarg);
X        break;
X    case 'o':        /* name of output file */
X        outfile = malloc ((unsigned) strlen (optarg) + 1);
X        (void) strcpy (outfile, optarg);
X        break;
X    case 'v':        /* produce verbose output */
X        verbose = 1;
X        break;
X    default:
X        (void) printf ("Usage: %s: %s\n",
X               "-ofilename [-ifilename] [-dN] [-hN] [-kN] [-sN]",
X               argv[0]);
X        exit (1);
X    }
X    }
X
X    /*
X     * Error if no output file was specified. Input file defaults to
X     * /usr/adm/wtmp.
X     */
X    if (outfile == NULL) {
X    (void) printf ("Error: no output file specified\n");
X    exit (1);
X    }
X
X    /*
X     * If no clip time or clip size is given, default action is to clip file
X     * at seven days.
X     */
X    if ((clip_time == 0) && (clip_size == 0)) {
X    clip_time = 7 * 24;
X    }
X
X    /*
X     * Make sure the user did not give both a time and size clip amount
X     */
X    if ((clip_size > 0) && (clip_time > 0)) {
X    (void) printf ("Error: -s option conflicts with -d/-h\n");
X    exit (1);
X    }
X
X    /*
X     * Do the size clipping.  This is the easiest case
X     */
X    if (clip_size > 0) {
X    size_clipper (infile, outfile, clip_size, verbose);
X    exit (0);
X    }
X
X    /*
X     * Convert the time spec into seconds and do the clipping
X     */
X    if (clip_time > 0) {
X    clip_time *= 3600;    /* convert hours to seconds */
X    if (clip_time > now) {
X        (void) printf ("Error: time spec is greater than current time\n");
X        exit (1);
X    }
X    clip_time = now - clip_time;    /* keep records newer than clip_time */
X    time_clipper (infile, outfile, clip_time, skip_size, verbose);
X    exit (0);
X    }
X
X    /*
X     * If I get to here, something is wrong so print a message
X     */
X    (void) printf ("Error: invalid combo of options, no action performed\n");
X    return (1);
X
X}
X
Xsize_clipper (infile, outfile, size, verbose)
Xchar           *infile;
Xchar           *outfile;
Xlong            size;
Xint             verbose;
X{
X    struct stat     sbuf;
X    int             nbytes;
X    int             fd1;
X    int             fd2;
X
X    size *= 1024;        /* convert Kbytes to bytes */
X    size /= sizeof (struct utmp);    /* How many utmp records is that? */
X    size *= sizeof (struct utmp);    /* convert back to bytes */
X
X    if (verbose) {
X    (void) printf ("trimming file to %d bytes (%d records)\n",
X               size, size / sizeof (struct utmp));
X    }
X    if (stat (infile, &sbuf) == -1) {
X    perror ("wclipper");
X    (void) printf ("Unable to stat file '%s'\n",
X               infile);
X    exit (1);
X    }
X    if ((fd1 = open (infile, 0)) == -1) {
X    perror ("wclipper");
X    (void) printf ("Unable to open file '%s' for input\n",
X               infile);
X    exit (1);
X    }
X    (void) umask (0);        /* make sure umask does not interfere */
X    if ((fd2 = creat (outfile, (int) (sbuf.st_mode & 0777))) == -1) {
X    perror ("wclipper");
X    (void) printf ("Unable to create output file '%s'\n",
X               outfile);
X    exit (1);
X    }
X    if (sbuf.st_size > size) {
X    size = sbuf.st_size - size;
X    if (lseek (fd1, size, 0) == -1) {
X        perror ("wclipper");
X        (void) printf ("I/O error seeking to position %ld in file %s\n",
X               size, infile);
X        (void) close (fd1);
X        (void) close (fd2);
X        exit (1);
X    }
X    }
X    while ((nbytes = read (fd1, (char *) ubuffer, UBUFSIZ)) > 0) {
X    if (write (fd2, (char *) ubuffer, (unsigned) nbytes) != nbytes) {
X        perror ("wclipper");
X        (void) printf ("I/O error writing %d bytes to file %s\n",
X               nbytes, outfile);
X        (void) close (fd1);
X        (void) close (fd2);
X        exit (1);
X    }
X    }
X
X    if (close (fd1) == -1) {
X    perror ("wclipper");
X    (void) printf ("I/O error reported while closing file %s\n",
X               infile);
X    (void) close (fd2);
X    exit (1);
X    }
X    if (close (fd2) == -1) {
X    perror ("wclipper");
X    (void) printf ("I/O error reported while closing file %s\n",
X               outfile);
X    exit (1);
X    }
X    if (verbose) {
X    (void) printf ("copy completed successfully\n");
X    }
X}
X
Xtime_clipper (infile, outfile, clip_time, skip_size, verbose)
Xchar           *infile;
Xchar           *outfile;
Xtime_t          clip_time;
Xint             skip_size;
Xint             verbose;
X{
X    struct stat     sbuf;
X    long            seekamt;
X    long            seekpos;
X    int             fd1;
X    int             fd2;
X    int             nbytes;
X
X    if (verbose) {
X    (void) printf ("trimming file at %s",
X               ctime (&clip_time));
X    }
X    if ((fd1 = open (infile, 0)) == -1) {
X    (void) printf ("Unable to open file '%s' for input\n",
X               infile);
X    exit (1);
X    }
X    if (stat (infile, &sbuf) == -1) {
X    (void) printf ("Unable to stat file '%s'\n",
X               infile);
X    exit (1);
X    }
X    (void) umask (0);        /* make sure umask does not interfere */
X    if ((fd2 = creat (outfile, (int) (sbuf.st_mode & 0777))) == -1) {
X    (void) printf ("Unable to create output file '%s'\n",
X               outfile);
X    exit (1);
X    }
X    seekamt = skip_size * sizeof (struct utmp);
X    seekpos = 0;
X    while (1) {
X    if (verbose) {
X        (void) printf ("seeking to record %d: ",
X               seekpos / sizeof (struct utmp));
X        (void) fflush (stdout);
X    }
X    if (lseek (fd1, seekpos, 0) == -1) {
X        (void) printf ("I/O error seeking to position %ld in file %s\n",
X               seekpos, infile);
X        exit (1);
X    }
X    nbytes = read (fd1, (char *) ubuffer, sizeof (struct utmp));
X    if (nbytes != sizeof (struct utmp)) {
X        (void) printf ("I/O error reading input file %s\n",
X               infile);
X        exit (1);
X    }
X    utmp = ubuffer;
X    if (verbose) {
X        (void) printf ("time stamp = %s",
X               ctime (&utmp -> ut_time));
X    }
X    if (utmp -> ut_time >= clip_time) {
X        if ((skip_size == 1) || (seekpos == 0)) {
X        break;
X        }
X        skip_size /= 2;
X        seekpos -= seekamt;
X        if (seekpos < 0) {
X        seekpos = 0;
X        }
X        if (skip_size < 1) {
X        skip_size = 1;
X        }
X        seekamt = skip_size * sizeof (struct utmp);
X    }
X    while ((seekpos + seekamt > sbuf.st_size) && (skip_size > 1)) {
X        skip_size /= 2;
X        seekamt = skip_size * sizeof (struct utmp);
X    }
X    seekpos += seekamt;
X    }
X
X    if (lseek (fd1, seekpos, 0) == -1) {
X    (void) printf ("I/O error seeking to position %ld in file %s\n",
X               seekpos, infile);
X    exit (1);
X    }
X
X    if (verbose) {
X    (void) printf ("begin copying at record number %d\n",
X               seekpos / sizeof (struct utmp));
X    }
X
X    while ((nbytes = read (fd1, (char *) ubuffer, UBUFSIZ)) > 0) {
X    if (write (fd2, (char *) ubuffer, (unsigned) nbytes) != nbytes) {
X        perror ("wclipper");
X        (void) printf ("I/O error writing %d bytes to file %s\n",
X               nbytes, outfile);
X        (void) close (fd1);
X        (void) close (fd2);
X        exit (1);
X    }
X    }
X
X    if (close (fd1) == -1) {
X    perror ("wclipper");
X    (void) printf ("I/O error reported while closing file %s\n",
X               infile);
X    (void) close (fd2);
X    exit (1);
X    }
X    if (close (fd2) == -1) {
X    perror ("wclipper");
X    (void) printf ("I/O error reported while closing file %s\n",
X               outfile);
X    exit (1);
X    }
X    if (verbose) {
X    (void) printf ("copy completed successfully\n");
X    }
X}
END_OF_FILE
if test 8993 -ne `wc -c <'wclipper.c'`; then
    echo shar: \"'wclipper.c'\" unpacked with wrong size!
fi
# end of 'wclipper.c'
fi
if test -f 'wtmp.fix.sh' -a "${1}" != "-c" ; then
  echo shar: Will not clobber existing file \"'wtmp.fix.sh'\"
else
echo shar: Extracting \"'wtmp.fix.sh'\" \(362 characters\)
sed "s/^X//" >'wtmp.fix.sh' <<'END_OF_FILE'
X: 'sh or ksh'
Xtrap ':' ERR
Xif test $(/bin/who | wc -l) -ne 0; then exit 0; fi
Xgetoff.sh 000
Xsleep 30
Xif test $(/bin/who | wc -l) -ne 0; then exit 0; fi
X/usr/local/bin/wclipper -i/etc/wtmp -o/tmp/wtmp -d14 -v
XST=$?
Xgeton.sh 000
Xif test ${ST} -ne 0; then exit ${ST}; fi
Xmv /etc/wtmp /etc/wtmp.old;mv /tmp/wtmp /etc/wtmp
Xchmod 644 /etc/wtmp
Xrm /etc/wtmp.old
Xexit 0
END_OF_FILE
if test 362 -ne `wc -c <'wtmp.fix.sh'`; then
    echo shar: \"'wtmp.fix.sh'\" unpacked with wrong size!
fi
chmod +x 'wtmp.fix.sh'
# end of 'wtmp.fix.sh'
fi
echo shar: End of archive 1 \(of 1\).
cp /dev/null ark1isdone
MISSING=""
for I in 1 ; do
    if test ! -f ark${I}isdone ; then
    MISSING="${MISSING} ${I}"
    fi
done
if test "${MISSING}" = "" ; then
    echo You have the archive.
    rm -f ark[1-9]isdone
else
    echo You still need to unpack the following archives:
    echo "        " ${MISSING}
fi
##  End of shell archive.
exit 0
--
David H. Brierley
Home: [e-mail]; Work: [e-mail]
Send comp.sources.3b1 submissions to [e-mail]
%% Can I be excused, my brain is full. **