packet creation and dumping hacks used by check_ica* and check_lotus

git-svn-id: https://nagiosplug.svn.sourceforge.net/svnroot/nagiosplug/nagiosplug/trunk@1100 f882894a-f735-0410-b71e-b25c423dba1c

contrib/packet_utils.pm

@@ -0,0 +1,120 @@
+package packet_utils;
+
+# $Id$
+
+# $Log$
+# Revision 1.1  2005/01/25 09:12:47  stanleyhopcroft
+# packet creation and dumping hacks used by check_ica* and check_lotus
+#
+# Revision 1.1  2005-01-25 15:28:58+11  anwsmh
+# Initial revision
+#
+	
+require Exporter;
+@ISA = qw(Exporter);
+@EXPORT_OK = qw(tethereal pdump);
+	
+sub tethereal {
+	my ($tethereal_dump, $start_byte) = @_ ;
+	
+	# Return a string or array (depending on context) containing the characters from a tethereal trace.
+	# Skip all stuff until the first byte given by $start_byte in the first row ..
+	
+	&outahere("Invalid tethereal dump:", substr($tethereal_dump, 0, 71), 'fails to match m#\d\d\d\d  \S\S(?: \S\S){1,15}#')
+		unless $tethereal_dump =~ m#\d\d\d\d  \S\S(?: \S\S){1,15}# ;
+	
+	my @tethereal_dump	= split(/\n/, $tethereal_dump) ;
+	my $first_line		= shift @tethereal_dump ;
+	$first_line			= unpack('x6 a48', $first_line) ;
+												# Take one extra space (after hex bytes) to use a template of 'a2 x' x 16 
+												# instead of 'a2 x' x 15 . 'a2'
+	my $last_line		= pop @tethereal_dump ;
+	$last_line			= unpack('x6 a48', $last_line) ;
+	
+	my $idx = index($first_line, $start_byte) ;
+	
+	&outahere(qq(Invalid tethereal dump: "$start_byte" not found in first line - "$first_line")) 
+		if $idx == -1 ;
+	
+	$first_line = substr($first_line, $idx) ;
+	
+	my ($dump, @dump) = ('', ()) ;
+	
+	my $bytes = 0 ;
+	$bytes++
+		while $first_line =~ m#\b\S\S#g ;
+	push @dump, unpack('a2x' x $bytes, $first_line) ;
+	
+	push @dump, unpack('x6 ' . 'a2x' x 16, $_) 
+		foreach @tethereal_dump ;
+	
+	$bytes = 0 ;
+	$bytes++
+		while $last_line =~ m#\b\S\S#g ;
+
+												# Be more cautious with the last line; the ASCII decode may
+												# have been omitted.
+
+	push @dump, unpack(('a2x' x ($bytes - 1)) . 'a2', $last_line) ;
+	
+	return wantarray ? map pack('H2', $_), @dump : pack('H2' x scalar @dump, @dump) ;
+	# return wantarray ? map hex($_), @dump : pack('H2' x scalar @dump, @dump) ;
+	
+}
+
+sub pdump {
+	my ($x) = shift @_ ;
+	my (@bytes_in_row, $row, $dump) ;
+
+	my $number_in_row = 16 ;
+	my $number_of_bytes = length $x ;
+	my $full_rows = int( $number_of_bytes / $number_in_row ) ;
+	my $bytes_in_last_row = $number_of_bytes % $number_in_row ;
+	my $template = "a$number_in_row " x $full_rows ;
+	my $nr = 0 ;
+												# Output format styled on tethereal.
+	foreach $row ( unpack($template, $x) ) {
+		@bytes_in_row = unpack('C*', $row) ;
+		$row =~ tr /\x00-\x1f\x80-\xff/./ ;
+		$dump .= join('  ', sprintf('%4.4x', $nr * 0x10), join(' ', map { sprintf "%2.2x", $_} @bytes_in_row), $row) ;
+		$dump .= "\n" ;
+		$nr++ ;
+	}
+
+	if ( $bytes_in_last_row ) {
+		my $number_of_spaces = ($number_in_row - $bytes_in_last_row)*3  - 2 ;
+
+												# 3 spaces (2 digts + 1 space) for each digit printed
+												# minus two spaces for those added by the join('  ',) below.
+
+		$row = substr($x, -$bytes_in_last_row) ;
+		@bytes_in_row = unpack('C*', $row) ;
+		$row =~ tr /\x00-\x1f\x80-\xff/./ ;
+												# my $bytes = join(' ', map { sprintf "%2.2x", $_} @bytes_in_row) ;
+												# See comment below.
+		my $spaces = ' ' x $number_of_spaces ;
+		$dump .= join('  ', sprintf("%4.4x", $nr * 0x10 ), join(' ', map { sprintf "%2.2x", $_} @bytes_in_row), $spaces, $row) ;
+		$dump .= "\n" ;
+	}
+
+	print STDERR $dump, "\n" ;
+
+=begin comment
+
+tsitc> perl -MBenchmark -e 'timethese(1_00_000, { printf => q<printf "%2.2x %2.2x %2.2x\n", 61, 62, 63>, sprintf => q<$x = sprintf "%2
+.2x %2.2x %2.2x\n", 61, 62, 63; print $x>} )' | perl -ne 'print if /intf/'
+
+Benchmark: timing 100000 iterations of printf, sprintf...
+    printf:  1 wallclock secs ( 0.55 usr +  0.00 sys =  0.55 CPU)
+   sprintf:  0 wallclock secs ( 0.11 usr +  0.00 sys =  0.11 CPU)
+
+so having sprintf in a loop seems more rational than a printf for the line ...
+
+=comment
+
+=cut
+  
+}
+
+	
+