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package packet_utils;
# $Id: packet_utils.pm 1100 2005-01-25 09:12:47Z stanleyhopcroft $
# 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
}
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