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#! /usr/bin/perl -w

# Copyright 1998 Hertzog Raphaël
# You can use this script under the term of the GPL v2 or later.

# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.

my $conf_file = '/etc/syslog.conf';

## BUGS :
#  . This script doesn't know about multi-lines configuration (ie with '\')
#  . With a line like that "mail,local0.* /anything" 
#    "syslog-facility remove local0" would remove the entire line
#    => should not be a problem since lines installed by this script
#    cannot use such syntax
##

## Nothing to modify after this line ##

my $command = lc(shift);

usage() if ($command !~ /^(?:set|remove)$/); 
usage() if (not scalar(@ARGV));

if ($command eq "set")
{
    usage() if (int(scalar(@ARGV) / 2) != scalar(@ARGV) / 2);
    # find a free localx facility
    my $facility = get_first_free_facility();
    # if none stop immediately
    if ($facility eq "none") {
	print "none\n";
	exit 1;
    }
    # ok append the lines asked
    open (CONF, ">>$conf_file") || 
        die "Can't open $conf_file in write mode: $!\n";
    my ($pri,$file,$line);
    while (defined($pri = shift)) {
	$file = shift;
	$line = "";
	foreach (split(/;/,$pri)) {
	    $_ =~ s/all/*/g;
	    $line .= ";" if ($line);
	    $line .= "$facility.$_";
	}
	$line .= "\t\t$file\n";
	print CONF $line;
    }
    close CONF;
    print "$facility\n";
    exit 0;

} elsif ($command eq "remove") {

    my $facility = lc(shift);
    my ($left,$file,$line);
    open (CONF, $conf_file) || die "Can't open $conf_file: $!\n";
    open (CONFNEW, ">$conf_file.new")  || 
	die "Can't open $conf_file.new in write mode: $!\n";
    while (defined($_=<CONF>)) {
	# Write all "simple" lines like empty lines and comments
	if (/^\s*$/ or /^\s*#/ or /\\$/) {
	    print CONFNEW $_;
	    next;
	}
	# Otherwise look if the facility to remove appears in the line
	if (/^\s*(\S+)\s+(\S+)\s*/) {
	    $left = $1; $file = $2; chomp $file;
	    # It doesn't appers => write
	    if ($left !~ /$facility/i) {
		print CONFNEW $_;
		next;
	    }
	    # It appears => write a new line without the localx facility
	    $line = "";
	    foreach (split(/;/,$left)) {
		if (not /$facility/i) {
		    $line .= ";" if ($line);
		    $line .= $_;
		}
	    }
	    next if ($line eq "");
	    $line .= "\t\t$file\n";
	    print CONFNEW $line;
	}
    }
    close CONFNEW;
    close CONF;
    rename ("$conf_file.new", "$conf_file");
}

sub get_first_free_facility {

    my @facility = (0) x 8;
    my ($left,$fac);
    open(CONF, $conf_file) || die "Can't open $conf_file: $!\n";
    while(defined($_=<CONF>))
    {
	next if (/^\s*$/);
	next if (/^\s*#/);
        next if (/\\$/);
	next if (not /^\s*(\S+)\s+(\S+)\s*$/);
	$left = $1;
	foreach $fac (split(/;/,$left)) {
	    $facility[$1]++ if ($fac =~ /local(\d)/i);
	}
    }
    foreach $fac (0..7)	{
	return "local$fac" if ($facility[$fac] == 0);
    }
    return "none";
}

sub usage {

    die  "syslog-facility - Copyright (c) 1998 Hertzog Raphaël\n"
	."Usage : $0 set <set_of_priority> <logfile> ... \n"
	."        it returns the 'LOCALx' string you have the right to use.\n"
	."        $0 remove <facility>\n"
	."Example: $0 set all /var/log/all\n"
	."         $0 set all\\;\\!=info /var/log/all-without-info\n"
	."         $0 set =err /var/log/errors =warning /var/log/warn\n"
	."         $0 remove LOCAL1\n";   
}