##########################################################################
# $Id$
##########################################################################

#####################################################
## Copyright (c) 2008 Kirk Bauer
## Covered under the included MIT/X-Consortium License:
##    http://www.opensource.org/licenses/mit-license.php
## All modifications and contributions by other persons to
## this script are assumed to have been donated to the
## Logwatch project and thus assume the above copyright
## and licensing terms.  If you want to make contributions
## under your own copyright or a different license this
## must be explicitly stated in the contribution an the
## Logwatch project reserves the right to not accept such
## contributions.  If you have made significant
## contributions to this script and want to claim
## copyright please contact logwatch-devel@lists.sourceforge.net.
#########################################################

$Debug = $ENV{'LOGWATCH_DEBUG'} || 0;
$Detail = $ENV{'LOGWATCH_DETAIL_LEVEL'} || 0;

if ( $Debug >= 5 ) {
    print STDERR "\n\nDEBUG: Inside Identd Filter \n\n";
    $DebugCounter = 1;
}

# This whole NeedNextLine thing is because there are multiple lines that
# go together for these log entries...

$ThisLine = <STDIN>;
while (defined($ThisLine)) {
    if ( $Debug >= 5 ) {
        print STDERR "DEBUG: Line Number " . $DebugCounter . ":\n";
        print STDERR "DEBUG: " . $ThisLine;
    }
    $NeedNextLine = 1;
    if ( ($IP,$Hostname,$Port) = ($ThisLine =~ m/^from: (\d+\.\d+\.\d+\.\d+) \( ([^ ]*) \) for: \d+, (\d+)$/) ) {
        # this means that somebody accessed identd...
        if ( $Debug >= 5 ) {
            print STDERR "DEBUG: Found -Connection From- Line -- Reading another line\n";
            $DebugCounter++;
        }
        if (defined($NextLine = <STDIN>)) {
            if ( $Debug >= 5 ) {
        	print STDERR "DEBUG: Line Number " . $DebugCounter . ":\n";
        	print STDERR "DEBUG: " . $NextLine;
            }
            if ( ($User) = ($NextLine =~ m/^Successful lookup: \d+ , \d+ : ([^ ]+)\.[^ ]+/) ) {
        	if ( $Debug >= 5 ) {
        	    print STDERR "DEBUG: Found -Successful Lookup- line (" . $User . ")\n";
        	}
        	${Identd{$IP}}[0] = $Hostname;
        	${Identd{$IP}}[1]++;
        	push @{${Identd{$IP}}[2]}, $Port;
        	push @{${Identd{$IP}}[3]}, $User;
            }
            else {
        	if ( $Debug >= 5 ) {
        	    print STDERR "DEBUG: No matches... keeping current line.\n";
        	}
        	$ThisLine = $NextLine;
        	$NeedNextLine = 0;
            }
        }
    }
    elsif ( ($IP,$Hostname) = ($ThisLine =~ m/^from: (\d+\.\d+\.\d+\.\d+) \(([^ ]*)\) EMPTY REQUEST$/) ) {
        if ( $Debug >= 5 ) {
            print STDERR "DEBUG: Found -Empty Request- Line\n";
        }
        $Text = "   " . $Hostname . " (" . $IP . ")";
        push @EmptyRequests,$Text;
    }
    elsif ( ($IP,$Hostname,$Name) = ($ThisLine =~ m/^from: (\d+\.\d+\.\d+\.\d+) \(([^ ]*)\) INVALID REQUEST: (.*)$/) ) {
        if ( $Debug >= 5 ) {
            print STDERR "DEBUG: Found -Invalid Request- Line\n";
        }
        $Text = "   " . $Hostname . " (" . $IP . ") - " . $Name;
        push @InvalidRequests,$Text;
    }
    elsif ( $ThisLine =~ m/^Returned: \d+ , \d+ : NO-USER/ ) {
        # Do nothing...
    }
    elsif ( ($Host) = ( $ThisLine =~ /^Connection from ([^ ]+)/ ) ) {
        chomp($Host);
        if (defined($NextLine = <STDIN>)) {
            if ( $Debug >= 5 ) {
        	print STDERR "DEBUG: Line Number " . $DebugCounter . ":\n";
        	print STDERR "DEBUG: " . $NextLine;
            }
            if ( ($Port,$User) = ($NextLine =~ m/^Successful lookup: \d+ , (\d+) : ([^ ]+)/) ) {
        	if ( $Debug >= 5 ) {
        	    print STDERR "DEBUG: Found -Successful Lookup- line (" . $User . ")\n";
        	}
        	chomp($Port); chomp($User);
        	${Identd{$Host}}[0] = $Host;
        	${Identd{$Host}}[1]++;
        	push @{${Identd{$Host}}[2]}, $Port;
        	push @{${Identd{$Host}}[3]}, $User;
            }
            else {
        	if ( $Debug >= 5 ) {
        	    print STDERR "DEBUG: No matches... keeping current line.\n";
        	}
        	$ThisLine = $NextLine;
        	$NeedNextLine = 0;
            }
        }
    }
    elsif ($ThisLine =~ /^Successful lookup: [1234567890]+ , [1234567890]+ : [^ ]+/ ) {
        # skip empty entry ...
    }
    else {
        # Report any unmatched entries...
        if ( $Debug >= 5 ) {
            print STDERR "DEBUG: Found unmatched line\n";
        }
        chomp($ThisLine);
        $OtherList{$ThisLine}++;
    }
    if ($NeedNextLine == 1) {
        $ThisLine = <STDIN>;
    }
}

if ( (keys %Identd) and ($Detail >= 10) ) {
    print "Identd Lookups:\n";
    foreach $ThisOne (keys %Identd) {
        print "   Host: " . ${Identd{$ThisOne}}[0] . " (" . $ThisOne . ") - " . ${Identd{$ThisOne}}[1] . " Connection(s).\n";

    }
}

if (($#EmptyRequests >= 0) and ($Detail >= 5)) {
    print "\nEmpty requests:\n";
    foreach $ThisOne (@EmptyRequests) {
        print "   " . $ThisOne . "\n";
    }
}

if (($#InvalidRequests >= 0) and ($Detail >= 5)) {
    print "\nInvalid requests:\n";
    foreach $ThisOne (@InvalidRequests) {
        print "   " . $ThisOne . "\n";
    }
}

if (keys %OtherList) {
    print "\n**Unmatched Entries**\n";
    foreach $line (sort {$a cmp $b} keys %OtherList) {
        print "$line: $OtherList{$line} Time(s)\n";
    }
}

exit(0);

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