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120 lines
2.5 KiB
Perl
Executable file
120 lines
2.5 KiB
Perl
Executable file
#!/usr/bin/env perl
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# -samy kamkar, rfid@samy.pl
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use strict;
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die "usage: $0 <file with data> <binary to search for>\n" unless @ARGV == 2;
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my ($file, $search) = @ARGV;
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$search =~ s/\s//g;
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# sure, these aren't perfect, but simplifies usability if you know what you're doing
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# if in doubt, use binary
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# binary, cool
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if ($search =~ /^[01]+$/) { }
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# decimal
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elsif ($search =~ /^\d+$/)
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{
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$search = unpack("B*", pack("N", $search));
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$search =~ s/^0*//;
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}
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# hex
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elsif ($search =~ /^[\da-fA-F]+$/)
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{
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$search = unpack("B*", pack("H*", $search));
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$search =~ s/^0*//;
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}
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# ascii
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else
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{
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$search = unpack("B*", $search);
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$search =~ s/^0*//;
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}
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# read file contents
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open(F, "<$file") || die "Can't read $file: $!";
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my $data = join("", <F>);
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close(F);
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# convert to binary
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$data =~ s/\s//g;
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# binary, great
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if ($data =~ /^[01]+$/) { }
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elsif ($data =~ /^[\da-fA-F]+$/)
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{
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$data = unpack("B*", pack("H*", $data));
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$search =~ s/^0*//;
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}
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else
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{
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die "Seriously. What sort of data is this file? Binary or hex only please.\n";
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}
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# search every method we know how
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print "Testing normally...\n";
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test_all($data, $search);
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print "Testing with flipped bits...\n";
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test_all($data, $search, 1);
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# now try manchester demodulating
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my @bits = split(//, $data);
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my $man;
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my $last = 0;
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for (my $i = 1; $i < @bits; $i++)
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{
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# if we changed, flip our bit
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if ($bits[$i-1] == 1)
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{
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$last ^= 1;
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}
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$man .= $last;
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}
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print "Testing with manchester demodulation...\n";
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test_all($man, $search);
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print "Testing with flipped manchester demodulation...\n";
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test_all($man, $search, 1);
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sub test_all
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{
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my ($data, $search, $flip) = @_;
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if ($flip)
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{
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$data =~ s/(.)/$1 ^ 1/eg;
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}
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# first just see if our data is in the stream
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if ($data =~ /$search/)
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{
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print "Found $search in our stream ($data)\n";
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}
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# try removing parity every 4 and 8 bits
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foreach my $parity (4, 8)
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{
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# try removing a parity bit every $parity bits
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# test by cutting off a bit at a time in case we're in the wrong bit position
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my $tmp = $data;
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foreach (1 .. $parity)
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{
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my $test = $tmp;
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$test =~ s/(.{$parity})./$1/g;
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if ($test =~ /$search/)
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{
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print "Found $search with parity every " . ($parity + 1) . "th bit, round $_ out of $parity ($test)\n";
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}
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# chop of a bit to change our bit position next round
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$tmp =~ s/^.//;
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}
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}
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}
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