FreeBSD-5.3/etc/periodic/security/security.functions

#!/bin/sh
#
# Copyright (c) 2001  The FreeBSD Project
# All rights reserved.
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# modification, are permitted provided that the following conditions
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# 2. Redistributions in binary form must reproduce the above copyright
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# $FreeBSD: src/etc/periodic/security/security.functions,v 1.3 2003/06/30 22:06:26 mtm Exp $
#

#
# Show differences in the output of an audit command
#

LOG="${daily_status_security_logdir}"
rc=0

# Usage: COMMAND | check_diff [new_only] LABEL - MSG
#        COMMAND > TMPFILE; check_diff [new_only] LABEL TMPFILE MSG
#   if $1 is new_only, show only the 'new' part of the diff.
#   LABEL is the base name of the ${LOG}/${label}.{today,yesterday} files.

check_diff() {
  rc=0
  if [ "$1" = "new_only" ]; then
    shift
    filter="grep '^>'"
  else
    filter="cat"
  fi
  label="$1"; shift
  tmpf="$1"; shift
  msg="$1"; shift

  if [ "${tmpf}" = "-" ]; then
    tmpf=`mktemp -t security`
    cat > ${tmpf}
  fi

  if [ ! -f ${LOG}/${label}.today ]; then
    rc=1
    echo ""
    echo "No ${LOG}/${label}.today"
    cp ${tmpf} ${LOG}/${label}.today || rc=3
  fi

  if ! cmp -s ${LOG}/${label}.today ${tmpf} >/dev/null; then
    [ $rc -lt 1 ] && rc=1
    echo ""
    echo "${msg}"
    diff -b ${LOG}/${label}.today ${tmpf} | eval "${filter}"
    mv ${LOG}/${label}.today ${LOG}/${label}.yesterday || rc=3
    mv ${tmpf} ${LOG}/${label}.today || rc=3
  fi

  rm -f ${tmpf}
  exit ${rc}
}