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-rwxr-xr-xcontrib/packet_utils.pm120
1 files changed, 120 insertions, 0 deletions
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1package packet_utils;
2
3# $Id$
4
5# $Log$
6# Revision 1.1 2005/01/25 09:12:47 stanleyhopcroft
7# packet creation and dumping hacks used by check_ica* and check_lotus
8#
9# Revision 1.1 2005-01-25 15:28:58+11 anwsmh
10# Initial revision
11#
12
13require Exporter;
14@ISA = qw(Exporter);
15@EXPORT_OK = qw(tethereal pdump);
16
17sub tethereal {
18 my ($tethereal_dump, $start_byte) = @_ ;
19
20 # Return a string or array (depending on context) containing the characters from a tethereal trace.
21 # Skip all stuff until the first byte given by $start_byte in the first row ..
22
23 &outahere("Invalid tethereal dump:", substr($tethereal_dump, 0, 71), 'fails to match m#\d\d\d\d \S\S(?: \S\S){1,15}#')
24 unless $tethereal_dump =~ m#\d\d\d\d \S\S(?: \S\S){1,15}# ;
25
26 my @tethereal_dump = split(/\n/, $tethereal_dump) ;
27 my $first_line = shift @tethereal_dump ;
28 $first_line = unpack('x6 a48', $first_line) ;
29 # Take one extra space (after hex bytes) to use a template of 'a2 x' x 16
30 # instead of 'a2 x' x 15 . 'a2'
31 my $last_line = pop @tethereal_dump ;
32 $last_line = unpack('x6 a48', $last_line) ;
33
34 my $idx = index($first_line, $start_byte) ;
35
36 &outahere(qq(Invalid tethereal dump: "$start_byte" not found in first line - "$first_line"))
37 if $idx == -1 ;
38
39 $first_line = substr($first_line, $idx) ;
40
41 my ($dump, @dump) = ('', ()) ;
42
43 my $bytes = 0 ;
44 $bytes++
45 while $first_line =~ m#\b\S\S#g ;
46 push @dump, unpack('a2x' x $bytes, $first_line) ;
47
48 push @dump, unpack('x6 ' . 'a2x' x 16, $_)
49 foreach @tethereal_dump ;
50
51 $bytes = 0 ;
52 $bytes++
53 while $last_line =~ m#\b\S\S#g ;
54
55 # Be more cautious with the last line; the ASCII decode may
56 # have been omitted.
57
58 push @dump, unpack(('a2x' x ($bytes - 1)) . 'a2', $last_line) ;
59
60 return wantarray ? map pack('H2', $_), @dump : pack('H2' x scalar @dump, @dump) ;
61 # return wantarray ? map hex($_), @dump : pack('H2' x scalar @dump, @dump) ;
62
63}
64
65sub pdump {
66 my ($x) = shift @_ ;
67 my (@bytes_in_row, $row, $dump) ;
68
69 my $number_in_row = 16 ;
70 my $number_of_bytes = length $x ;
71 my $full_rows = int( $number_of_bytes / $number_in_row ) ;
72 my $bytes_in_last_row = $number_of_bytes % $number_in_row ;
73 my $template = "a$number_in_row " x $full_rows ;
74 my $nr = 0 ;
75 # Output format styled on tethereal.
76 foreach $row ( unpack($template, $x) ) {
77 @bytes_in_row = unpack('C*', $row) ;
78 $row =~ tr /\x00-\x1f\x80-\xff/./ ;
79 $dump .= join(' ', sprintf('%4.4x', $nr * 0x10), join(' ', map { sprintf "%2.2x", $_} @bytes_in_row), $row) ;
80 $dump .= "\n" ;
81 $nr++ ;
82 }
83
84 if ( $bytes_in_last_row ) {
85 my $number_of_spaces = ($number_in_row - $bytes_in_last_row)*3 - 2 ;
86
87 # 3 spaces (2 digts + 1 space) for each digit printed
88 # minus two spaces for those added by the join(' ',) below.
89
90 $row = substr($x, -$bytes_in_last_row) ;
91 @bytes_in_row = unpack('C*', $row) ;
92 $row =~ tr /\x00-\x1f\x80-\xff/./ ;
93 # my $bytes = join(' ', map { sprintf "%2.2x", $_} @bytes_in_row) ;
94 # See comment below.
95 my $spaces = ' ' x $number_of_spaces ;
96 $dump .= join(' ', sprintf("%4.4x", $nr * 0x10 ), join(' ', map { sprintf "%2.2x", $_} @bytes_in_row), $spaces, $row) ;
97 $dump .= "\n" ;
98 }
99
100 print STDERR $dump, "\n" ;
101
102=begin comment
103
104tsitc> perl -MBenchmark -e 'timethese(1_00_000, { printf => q<printf "%2.2x %2.2x %2.2x\n", 61, 62, 63>, sprintf => q<$x = sprintf "%2
105.2x %2.2x %2.2x\n", 61, 62, 63; print $x>} )' | perl -ne 'print if /intf/'
106
107Benchmark: timing 100000 iterations of printf, sprintf...
108 printf: 1 wallclock secs ( 0.55 usr + 0.00 sys = 0.55 CPU)
109 sprintf: 0 wallclock secs ( 0.11 usr + 0.00 sys = 0.11 CPU)
110
111so having sprintf in a loop seems more rational than a printf for the line ...
112
113=comment
114
115=cut
116
117}
118
119
120